OSK not displaying characters on MacOS


I built a simple keyboard using Keyman Developer on Windows 10. I installed the keyboard on a MacOS system.

The OSK on Windows displays all the layers correctly.

On MacOS, the main layer and Shift layer display correctly, but the Alt and Alt+Shift layers are blank. No characters are displayed in these layers.

But, I am able to type the characters correctly! I just can’t see them on the OSK.

I also installed one of the keyboards from the Keyman website and that keyboard has all the layers displayed correctly (including Alt and Alt+Shift) on MacOS, so I don’t think it’s a settings issue.

Has anyone seen this problem before?

Can you DM me the keyboard package file so I can test it on my side?