Forge: 40.1.19
Mod Version: 2.1.10-b03

Upon taking waterskin out of icebox and putting it in your invenotry, the game crashes.
crash-2022-05-11_05.37.11-client.txt

It also crashes whenever you try to load up the same world that crashed.
crash-2022-05-11_05.51.05-server.txt
crash-2022-05-11_05.51.10-client.txt

This crash is actually a bit misleading. I've heard a lot of reports about the icebox causing a crash, but it's actually being caused by the waterskin itself being in your inventory. That's why it crashes when you try to rejoin.
This has already been addressed internally, and it will be fixed in the next update.