Hi!
When creating the condensed and expanded styles of the font, a red error sign appears in the images for glyphs such as Aogonek and aogonek. What does the letter T next to the sign mean? This error only appears with some glyphs.
As you can also see in the Validation panel, the specific glyph layers contain transformed components. This is not a real issue, however as the specification does not allow mixed transformations, such glyphs will be decomposed.
The specific letters that relate to interpolation issues are:
O → Outlines
M → OutlineContourMismatch or OutlineComponentMismatch
F → OutlineContourFlavour (layers contain mixed quadratic and cubic contours)
N → OutlineNodeType (mismatch in On and Off curve nodes)
D → OutlineContourDirection
S → OutlineContourStart
W → OutlineContourSwapped or OutlineComponentSwapped
T → OutlineGlyphMatrix (Scaling, Rotation, Skewing)
A → Anchors
Thank you.