issue with mark interpolation on alternate layer

Glyphs
1

Hi

i faced an issue about mark interpolation when i used alternate layers, i’m not sure if it’s caused by the odd/unusual structure of the source (or ot-features) or related to a Glyphs app bug.

ezgif-79b2c9194887f6a5

here is a subset of the source:

K.glyphs (28.0 KB)

with this text(dlig on):

فَِیَِ

3

There seems to be a problem with getting the anchors from the nested alternate layers. I’ll have a look.
But in cases like this, it might be easier to manually build extra glyphs and write the feature variations.

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