Not sure if others had the problem as well where you weren’t able to use /e sit, /e foldarms or /e sitsad anymore? Posting it in here, as a reaction, in case others might have the problem too.
According to AnimationList.lua, they all have the dictionary anim@amb@business@bgen@bgen_no_work@ in common.
When looking it up on the internet I couldn’t find anything. After deactivating every resource in my server, I found out that mpheist3 was somehow blocking these 3 emotes. I removed the file anim@amb@business@bgen@bgen_no_work@.ycd from the stream folder in mpheist3, restarted the server and now these three emotes are working again. Unsure if this might cause any other problems, but at this moment everything works fine.