Glyph class with predicate tokens only works in variable font

Glyphs
1

I’m trying to replace the combining lowline glyph with one that has a width corresponding to the preceding glyph’s width. I generate the feature code for the rclt feature based on the layer width:

sub [$[layer0.width==224]] lowlinecomb' by lowlinecomb.224;
sub [$[layer0.width==288]] lowlinecomb' by lowlinecomb.288;
sub [$[layer0.width==320]] lowlinecomb' by lowlinecomb.320;
sub [$[layer0.width==384]] lowlinecomb' by lowlinecomb.384;
sub [$[layer0.width==416]] lowlinecomb' by lowlinecomb.416;
sub [$[layer0.width==480]] lowlinecomb' by lowlinecomb.480;
sub [$[layer0.width==512]] lowlinecomb' by lowlinecomb.512;

etc.

This only seems to work in the variable font export. Is this a known issue?

Bildschirmfoto 2025-03-14 um 18.40.27
Bildschirmfoto 2025-03-14 um 18.40.27474×373 12 KB

2

Are the widths the same in all masters?

3

It was a user error, I got it working now (there was a leftover custom parameter to remove the rclt feature).

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