There is a major problem with Taxonomies not showing on the backend. i have disabled every snippet that could affect MetaBox and WP Admin backend, still does not work. I had a similar issue a couple months back concerning Taxonomies (would not load and provoked critical website error).
Basically cannot edit my Group Fields anymore, this is very problematic.
See video : https://www.loom.com/share/60d9b71d0c3e44a88b339153e19b2222