Paste text copied from some sources throws error

[jjezik82]

When I'm pasting a text copied from some sources, I get InvalidCharacterError in console and pasted text disappears.

InvalidCharacterError: Failed to execute 'setAttribute' on 'Element': 'unicode",' is not a valid attribute name.

And sometimes when writing inside text element, after few words cursor jumps to the beginning.

Is there anything I can do about it?

[artf]

Hey @jjezik82, from the error, it looks like the pasted HTML is not correct.
Are you able to provide any kind of reproducible demo?