Samsa shows interpolated instance 500 at 499.99

[RosaWagner]

Problem is when there is substitution at 500, then it is not displayed.

Test Case
In this test, letter G is supposed to be a circle in Medium SemiExpanded instance.

[Lorp]

That is curious. The substitution happens at the very next possible value for the axis (when you use the arrow buttons to increase by a tiny amount).

glyph	wght (dec)	wght (normhex)	Samsa	Webfont
G	499.9755859375	0x1554	rectangle	rectangle
G	499.993896484375	0x1555	circle	rectangle
G	500.01220703125	0x1556	circle	circle

Are you able to test on another platform, Windows or Android, to verify this is a bug in Samsa rather than the Apple renderer?

Could you also write down what the subsitutions are supposed to be doing, since there are multiple overlapping substitutions?

[ErwinDenissen]

Samsa works as expected, e.g. it shows the circle with the Medium SemiExpanded instance. However directly viewing the variable font in Edge, Chrome, or Firefox on Windows all show a rectangle. It must be some rounding issue.