I am trying to use the ai_tracker villager functions, which all give errors. Most of the errors are particle-related, unhandled events. Unfortunately, I can't get a good screenshot as it crashes my server and client.

Seems like Mojang changed some particle names/how to get them, specifically the ones our fallback uses. That or there's something broken in Carpet's code for finding them (unlikely).

However if you have Carpet in both the client and the server (or singleplayer) you should be getting nicer Carpet shapes, tho network is currently broken, tracked in #1903.

same issue, any way to fix?

Update carpet and carpet gugle addition solved this issue