In previous add-ons, the button is moved incorrectly.
I have never seen it work after BFA( the addon was updated

The button with the mushroom icon seems to me like it's the ExtraActionButton, not ExtraQuestButton, since there are no quest items with that icon in the game.

This addon does not move the ExtraActionButton.

The same problem with quest items - I didn't have time to take a screenshot

Previously there was no difference in ExtraActionButton and ExtraQuestButton?

Everything worked thanks to one of your add-ons...

Previously there was no difference in ExtraActionButton and ExtraQuestButton?

ExtraQuestButton only looks like ExtraActionButton, that's the only similarity. This addon used to move the ExtraActionButton, but maintaining that was a nightmare because other addons also try to move it (e.g. actionbar addons), so it was removed.
See the changelog for 90000.15-Release.