Codemirror6 vimmode encounters problems on tiddlyhost

I made codemirror6 into a tiddlywiki plugin, and added the codemirror-vim extension. Everything works very well, whether it is hosted locally or online My TiddlyWiki — a non-linear personal web notebook %3A%2Fplugins%2Foeyoews%2Ftiddlywiki-codemirror-6

But on tiddlyhost’s hosting website (https://cm6-bug-on-tiddlyhost.tiddlyhost.com), I encountered the following error. I am not sure whether it is a problem with tiddlyhost or codemirror-vim.

Steps to reproduce: Enter xxx, select and delete them all and the problem in the video will be triggered.

@simon Does tiddlyhost do any special processing for html files uploaded by users? Because if you enable vimmode at My TiddlyWiki — a non-linear personal web notebook, you will not encounter errors.