Minecraft 1.19.3
Fabric Loader 0.14.12
Fabric API 0.72.0
do a barrel roll 2.5.1

If I try to stop the server, the cicada threads won't stop and keep the process alive.
The process needs to be killed. This behaviour prevents clean auto restarts.

See threaddump: https://hastebin.com/farapemifu.pl

Oh I see, thats a big problem. It'd have been a while before I caught that one myself, so thanks for letting me know. I'll definitely look into it.

Just published 2.5.2, it should contain a fix. (Let me know if it doesn't work for whatever reason, I haven't tested it extensively)