Pressing button "Edit" on [kinda] any page with WikiEditor enabled (previously I thought it was CodeEditor) lead me to page with damaged view, where there are coloured spots above with no code (in front of big white square) and the code is below (in a window).
This error is inconsistent. I don't know why. I disable/enable another extensions — it works fine some time and then it corrupt again.
MW 1.39.1. I experienced it on 1.34, too. I've updated all dependencies via Composer. Can anybody suggest the reason?