Microsoft ToDo messing Cyrillic texts with symbol м

Steps to reproduce:

1. Create a task in web version (browser: Mozilla Firefox 75.0, OS X)

2. Type just one symbol in Note section: "м" (Cyrillic alphabet)

3. Click on area outside of the Note section

4. "м" changes to "&#1084 ;"

Text seems to return back to normal state if there's only one symbol and you click Note section again but the app ruins text completely for larger texts.