UniversalTweaks v1.6.0 conflicts with the TouhouLittleMaid mod, causing the game to crash upon joing the world. It appears to be related to LinkedHashSet.
Changing the S:"Tile Entity Map" from "CONCURRENT_LINKED_HASHMAP" to "HASHMAP" does not resolve the issue, the game continues to crash with the same error message.
Reverting back to version 1.5.0 eliminates this problem.
crash-2023-05-13_10.47.24-server.txt

This is unrelated to tile entities, you have enabled the Concurrent Entity AI Tasks bugfix which is not compatible in every modded scenario, hence disabled by default. Setting it back to false helps your case, just reproduced it.