Hi there! There seems to be a bug when applying OpenType Stylistic Sets to fonts that have feature variations. This has occurred with multiple fonts produced by me and colleagues, so I have made a simplified test font that you can use to duplicate the issue.

A summary of the issue is below, and you can find full documentation and the test files here: https://github.com/djrrb/Italic-Alternates-Test

Version of Adobe InDesign: InDesign 16.2.1

Steps to reproduce the issues:
- select variable font with feature variation
- use variable font slider or select named instance to apply feature variation
- apply opentype stylistic set that affects same glyph as feature varation

Expected result: Alternate glyphs from Stylistic Sets are applied to font.

Actual result:
- Selecting alternates from tooltip does nothing
- Applying stylistic set to selection does nothing
- Contextual menu says “OpenType properties are not available” even though they are

(This seems like a distinct issue from
https://indesign.uservoice.com/forums/601180-adobe-indesign-bugs/suggestions/43153443-variable-fonts-feature-variations-not-working but perhaps they are somehow related.)

Many thanks!