Version info
Minecraft 1.21.1
Portable Tanks 1.1.7
SuperMartijn642's config library 1.1.8
SuperMartijn642's core lib 1.1.17+e

Steps to reproduce
Breaking any tank causes the crash. The game exits to a connection lost screen (see attached screenshot). Item descriptions are also broken and say "portabletanks.portable_tank.info.capacity"

Crash report (~/logs/latest.log)
Crash log is too long to copy/paste here. See attached .txt file for log
2024-10-22-1.log

I cannot reproduce the crash.
According to the log, the error comes from trying to save some item stack which has an unregistered data component. Portable Tanks doesn't add any data components. It is likely from some other mod you have installed.