Strange Issue With Notes Inheriting Things Like Tags and CSSClasses

In addition to the debug info mentioned above, the troubleshooting steps are here to go through.

It looks like there are a lot of community plugins installed in that vault. I would try turning half OFF, restarting, and checking the behavior. If the issue is still there, try turning the other half OFF. Rinse and repeat. Hopefully you can narrow down the culprit(s).