Bug in Variable font export

With a typeface on which I am currently working, I have a bug with the Variable font export file.

With Instances export, letters “b” and “d” are correctly interpolated but in the VF, here’s what’s going on :

The problem is the one single brace layer in the “b”. It partially cuts the space. And I don’t think it makes a difference.

Oh ! I didn’t notice there was a residue of brace trick here…
Thanks Georg !

And I would try to remove some masters. even with a design like this, five steps on the weight axis seem to be a bit much.

Intermediate master are here to set manual spacing (I don’t want a lineal interpolation of metrics)