Hello,
It appears the the TileMapScale plugin is always activated at QGIS opening, even though it appears as deactivated (red circle with a checkmark). If I want to really deactivate it, I have to activate it and then deactivate it again.
I think the problem is in the file "canvas_adapter.py".
In init(), the variable self._isActive is hardcoded to "True" while in my opinion, it should read the value in QSettings.
Thanks