I have these custom parameters on the variable font export.
It works fine normally, but it fails if there is a brace layer on the glyph
{
customParameters = (
{
name = Filter;
value = "RemoveOverlap;";
},
{
name = Filter;
value = "RoundCorner;15;1;";
},
{
name = Filter;
value = "RoundCorner;-4;1;";
}
);
}