Hello,
Version of Joplin : 2.8.8 (prod, win32)
operating system : Window 10
It is a problem with the Markdown editor. I installed the "Rich Markdown" plugin, I uninstalled it and reinstalled it finally but got this : a new panel on the right of the markdown editor saying : "Change notes back and forth if you see this" (image below)
This is not a bug with Joplin or the Rich Markdown plugin. It is coming from another plugin you have installed. Please try uninstalling your plugins one at a time until the note goes away.
Also if you share which plugins you have installed, I might be able to search them to see which causes this.
It seems that the Automatice backlink to note plugin is not active anymore.
The Note Link System plugin (which is inspired of the latter plugin) seems to have the same functionality.
I don't know what to do ? Should I report the bug ?