I have a custom parameter to remove the mark and mkmk features. Still some mark and mkmk feature is present in the exported fonts (for a small number of glyphs). When I export with Glyphs 3.1.2, the features are not there, as they should.
Right. I fixed it.
Same here, I’m setting up a font with a lot of different exports.
In the Regular the fonts export fine, in the Italic the Trial fonts give errors about missing glyphs in locl calt and smcp.
While locl is double (custom and auto) and gets removed twice, and once at the end after an * (has been set-up by @mekkablue), the calt feature is only single, but seems not to get removed.
Is there a way to clear ALL features?
Could you send me the .glyphs file?
Hey @GeorgSeifert, thanks for your response.
All these features have comments below.
# Add at beginning: that contain the glyphs mentioned in the Export Result error report.
I will send you the file.
@GeorgSeifert have you been able to look into this?
Any tips how to resolve this, without making an extra file fot the Trial fonts?
You have two “Remove Features” parameters, only the first one is picked up.
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Thanks, everything runs smoothly now.
Probably they have been put in there twice, to switch one of, depending on export.
However, now I’m able to work with Project Files, that are super handy with such an intricate project.
Thanks again 
have a great day!