Sorry for the late response, but further tries to narrow down the actual cause somewhat failed.
This isn’t reproducible on every server, as trying to invoke this behavior on a ‘vanilla’ server with only the loading screen being addon failed (So I was wrong).
Comparing the output Chromium gave me shows only two differences between normal and ‘bugged’ behavior.
After disconnecting and during game shutdown I get these prints:
CEF Output
[0203/223113.046:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = nui://vending_prp/vending/html/prop_glass_02_sprop_glass_04_a.html, status = 4, exit_code = 258
[0203/223113.071:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = nui://vending_prp/vending/html/p_v_vend_snak_01.html, status = 4, exit_code = 258
[0203/223113.114:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/8910/_qVEnMQAFEKQJENdLWw6HA/2_0.jpg, status = 4, exit_code = 258
[0203/223113.133:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/0822/83axdSaAS02J-Z0e1df-jw/2_0.jpg, status = 4, exit_code = 258
[0203/223113.151:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/0893/oeWgDf7GN0CkLszt8JRjfQ/2_0.jpg, status = 4, exit_code = 258
[0203/223113.156:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/7980/JwAm0wWMbkmHa_TKIoau7w/2_0.jpg, status = 4, exit_code = 258
[0203/223113.162:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/3941/A7jqgI-h9k2au7dj7gRsmw/2_0.jpg, status = 4, exit_code = 258
[0203/223113.174:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/8573/0sQw52xaekGDJIglmG8TUw/2_0.jpg, status = 4, exit_code = 258
[0203/223113.182:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/4061/BnJdo30Ppkaknghd3xD00A/2_0.jpg, status = 4, exit_code = 258
[0203/223113.187:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/4998/vyTABS5xR06--t_w6e9t0w/2_0.jpg, status = 4, exit_code = 258
[0203/223113.193:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/4870/WAyVbig6OkSMbD7lapk84w/2_0.jpg, status = 4, exit_code = 258
[0203/223113.204:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/9262/g9pM0C_DoUan2t_kzpL0lA/2_0.jpg, status = 4, exit_code = 258
[0203/223113.211:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/2013/0shqLVDjd0qVDv-CHUv8ew/2_0.jpg, status = 4, exit_code = 258
[0203/223113.217:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/0126/DaHBvkP7dEKCdy1qPA78Ew/2_0.jpg, status = 4, exit_code = 258
[0203/223113.223:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/3134/JrbYCpLGdUuU2rhvsSW2wQ/2_0.jpg, status = 4, exit_code = 258
[0203/223113.240:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/6518/tQArg4sDt0-ATPwkAa4UcA/2_0.jpg, status = 4, exit_code = 258
[0203/223113.247:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/5499/akcrtIfrH0ioverkdkdD0A/2_0.jpg, status = 4, exit_code = 258
[0203/223113.252:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/3054/B6r3Irqu8UuE5CyqpI512A/2_0.jpg, status = 4, exit_code = 258
[0203/223113.257:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/3981/rtNlyMjwx02EehGBGELmFA/2_0.jpg, status = 4, exit_code = 258
[0203/223113.271:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/8523/159dEmF19k69-8RrYQSXbg/2_0.jpg, status = 4, exit_code = 258
[0203/223113.276:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/2314/mZ0PcmK-lUusdC3d_db6CA/2_0.jpg, status = 4, exit_code = 258
[0203/223113.281:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/5403/8PrF1PzohUGVERk5IH68Ew/2_0.jpg, status = 4, exit_code = 258
[0203/223113.287:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/9015/xHqN1GOv1E2mcmcpaKOJHQ/2_0.jpg, status = 4, exit_code = 258
[0203/223113.296:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/8469/8EC28lyqjUC4QbYzyAs7_Q/2_0.jpg, status = 4, exit_code = 258
[0203/223113.301:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/4151/zQMPw-QFBkWXsA5yrEHiBg/2_0.jpg, status = 4, exit_code = 258
[0203/223113.306:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/6062/-DkdoRcQK0SZ04rrxvOjlA/2_0.jpg, status = 4, exit_code = 258
[0203/223113.311:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/3874/ddHtd5ObCUulYYRG6CnSzw/2_0.jpg, status = 4, exit_code = 258
[0203/223113.318:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/2688/od2MHwZ-z0y_oxYOCJiadw/2_0.jpg, status = 4, exit_code = 258
[0203/223113.339:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/8354/vLWtKE-4yUed3CDCX_Ry8Q/2_0.jpg, status = 4, exit_code = 258
[0203/223113.346:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/9899/zZYDkgMl70OUOKlj9BsLtA/2_0.jpg, status = 4, exit_code = 258
[0203/223113.352:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/4846/YmiHpz6bBU2g78fo4GrJng/2_0.jpg, status = 4, exit_code = 258
[0203/223113.361:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/7862/j9KIsGgp0keTks4rjlqoTg/2_0.jpg, status = 4, exit_code = 258
[0203/223113.364:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/5811/e-ICTCVrgUSCdDjRyg3x9w/2_0.jpg, status = 4, exit_code = 258
[0203/223113.369:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/6252/3imRTH7ehEWmDwW2-mncmg/2_0.jpg, status = 4, exit_code = 258
[0203/223113.374:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/6477/kxV5YVMQSEKY04MseoEmFA/2_0.jpg, status = 4, exit_code = 258
[0203/223113.378:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/2525/Y-Vv0cIN2Uqxx3xR2PALag/2_0.jpg, status = 4, exit_code = 258
[0203/223113.398:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/8023/mPCp2HY4VUOpJOo3XNyLJQ/2_0.jpg, status = 4, exit_code = 258
[0203/223113.482:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/8349/rN2-NtpRNEuCccGeEW7I5g/2_0.jpg, status = 4, exit_code = 258
[0203/223113.527:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/7474/2Y2HGHWTb0i_raVNjGnoXg/2_0.jpg, status = 4, exit_code = 258
[0203/223113.635:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/3793/o8yNzLS0O02Ld5w_h8CKtw/2_0.jpg, status = 4, exit_code = 258
[0203/223113.649:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/6681/s8A3DDORE0CN5zUKPB4dLQ/2_0.jpg, status = 4, exit_code = 258
[0203/223113.656:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/4061/BnJdo30Ppkaknghd3xD00A/2_0.jpg, status = 4, exit_code = 258
[0203/223113.660:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/8098/JnlKjCjByEmNdTbWvzppZQ/2_0.jpg, status = 4, exit_code = 258
[0203/223113.670:INFO:render_frame_host_impl.cc(11505)] RenderFrameHostImpl::MaybeGenerateCrashReport url = https://prod.cloud.rockstargames.com/ugc/gta5mission/6684/eV8RvueYtUyboNpN_7UWag/2_0.jpg, status = 4, exit_code = 258
(Which show some similarity to the logs included in the bug report before mine)
After reconnecting and during game init this print probably shows something is wrong:
[0203/223158.445:INFO:CONSOLE(0)] "Autofocus processing was blocked because a document already has a focused element.", source: nui://game/ui/root.html (0)
(but doesn’t give any helpful context)
As this probably won’t help anyone with further investigating this and no dumps show anything obvious (and no crash dumps are produced in relation to this) I’ve sent you a server IP via PM where this behavior is constantly reproducible (This is a test server as I just assumed you don’t wanna join any random Discord guilds to be able to join a server)