Pages (and iOS/iPadOS) handling of a Unicode Greek character...
A Unicode character for a Greek letter (the obsolete ligature stigma symbol "ϛ", U+03DB "Greek small letter stigma") displays fine on my MacBook (OSX 10.10.5; Pages 5.5.2) but both on iPhone (iOS 15.7.3; Pages 13.0) and iPad (iPadOS 16.3.1; Pages 12.2.1), it renders with extra space before and after the character, so it's essentially useless in reproducing written words. It has the same issue in other apps (eg. Simplenote 4.48 on iOS), and in the system itself, when used as part of a filename, for example.
This is unexpected insofar as I thought Unicode characters would all be handled as standard letters independently of version of app or OS - but apparently not so? Is there a fix, or a workaround that might help? Not to be petty, but tricky typography issues were once the pride and joy of Apple, so I'm hoping it's just my relative incompetence that's the problem here...