Glyphs 3 does interpret differently the Master Compatibility.
For example having two masters and for it two instances one italic the other upright.
The two instances do not have an conflict, however master compatibility shows an error.
The master compatibility displays errors even if there is no interpolation conflict.
The same happens also within the glyphs-overview-window, the glyphs have the error-red-triangle in the corner.
Is this an new feature (to focus more on variable fonts) or is this a bug?