Reverting to file format 2 possible?

Trying to revert a VF from Glyphs file format 3 to 2 yields the following error message: The Variable Font Settings contains custom parameters. This can’t be saved as format 2.

The message isn’t very clear, as custom parameters have existed before.

I’ve attached a screenshot of the Font Info. Which parameters could be referenced here and could this be solved?

That’s mean some of Custom Parameters used on your project are not compatible with Glyph 2.
Maybe the problem come from a Custom Parameters in a Master or in an Export.

You can check for each of them if it is available in Glyphs 2, to find which ones are problematic.

I think it refers to the new export settings for variable fonts and their custom parameters.

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