I'm having the same issue on Windows 11 with both Microsoft Edge & Firefox browsers. So I suspect this is an Apple bug rather than a Windows issue. This is a problem for me as I am constantly updating shared notes. I suspect Apple aren't that interested in supporting Windows so this could take a long time to be resolved.
I don't want to try the workarounds suggested here (copying the note contents, deleting the note, creating a new one and pasting in the old content) as that means the note has to be reshared and will break things if anyone else is editing it at the same time.
Are there any good third party products that allow shared notes on iphone/windows/web?