Game has a seizure if you try to input a custom name for a world

This bug affects all versions of 1.18.x (1.18-1.18.2) I've tested. It doesn't affect 1.17.1.

Steps to reproduce:
Load up 1.18.x
Try making a new world with a different name
The game will flash red and hang

Edit: this bug only happens if you don't already have a world pre-generated for whatever reason.