@Trimoth The mod was Simulation Lag Fix, this removed their issues with routing to trash cans and sinks. Strange, considering the purpose of the mod XD
However, the original issue is still there, and I found a way to reproduce it on a backed up save (not on a clean save tho).
When you schedule an event (Keg Party in my case) AND you have a celebration going on (in my case Founder's Remembrance, custom thing), it leads to a behavior described in a original post (time stops, animations circulating, nothing else happens, saving and go to manage worlds is not possible).
I tried to not schedule Keg Party, everything's fine. Tried to schedule the day after when there is no celebration, everything's fine. Not sure what's going on, but at least this sounds like a workaround.
