Variable Export: Glyph “f_k” is not compatible


I am running into an error trying to export a Variable .TTF font:

Attaching a minimal test-case file below.
Test 1.glyphs (5.5 KB)

Thanks for any pointers.

Never mind, removing the component inside “f_k” and inserting it again did the trick.

Still, some strange behaviour as I see no incompatibility warnings.