If I use qqc2-desktop-style with Qt Quick Components 2 then some button labels are not displayed correctly. For example "*" or emojis like "😀" as the complete label result in empty buttons. If I add a normal letter (e.g. "a😀") to the label then it is displayed correctly. With the fusion style everything works as expected.
Works for me with version 5.78. Is this still an issue you're facing?
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This bug had been fixed in the meantime.
Cool, thanks.