[dsevil]

Ok so there's no capital or small Y with breve in Unicode.

Are you seeing the combining breve to the right of the Y/y (instead of atop it) when trying to use them?

Your suggestions are welcome, thank you!

[ahazred8ta]

I'll note the diacritics test page at https://alanwood.net/unicode/combining_diacritical_marks.htm... -- is there a better one?