Using --server command line argument crashes the game

When using the -server and -port command line arguments the game crashes with "java.lang.NullPointerException: Tesselating block in world".

Appears to be related to MC-125451.

This can be reproduced by somehow launching the game directly with those arguments, or creating a custom launcher version JSON file with the arguments.

Perhaps this isn't considered worth fixing, but I thought I'd report it regardless 🙂