Activating the pocket dimension multiple time will cause the game to freeze (entering and exiting)
MC 1.12.2
5.2.101-beta-clientonly.jar
7.2.05-universal.jar
Can't give a crash report as the game doesn't generate one for the issue I'm having
latest.log
I'm playing singleplayer so I'm not sure whether that counts as server or client.

Looks like a missing mapping. I do apologise, but the 1.12.2 version is EOL (End of life) as newer versions are being maintained. This is not a critical bugfix, so this will not be fixed.

Ok, I just rolled back to the previous version and it's working fine.