Is MacCatalyst UITextview's Spellchecker broken?

UITextview's Spellchecker seem not to detect spells and show red dots at odd position in MacCatalyst:

It does work well in iPhone and iPad though.

I've activated the Spellcheck through storyboard, also tested with both Normal and Attributed strings. Even tried disabling the scrolling. But nothing seems to help!

Does any one know about this behaviour?

Which OS version are you running on?

Is MacCatalyst UITextview's Spellchecker broken?
 
 
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