I had no problem converting worlds to 1.13 pre-4, but when I try to do the same with 1.13 pre-5 the game crashes. I tried converting from several versions: 1.10.2, 1.12.2, and 1.13 pre-4--all resulting in a game crash.
MC-132542
Game crashes when converting world to new update
Resolved
Incomplete
0
Incomplete without a crash report from (minecraft/crash-reports/crash-<DATE>-client.txt). Please attach it to this ticket so that we can diagnose your issue.