If I draw two shapes on the same layer, one on top of the other, then when I use the Interpolate Sequence function, the bottom shape comes out in front. In Blender 2.92, this function works correctly!
I confirm the issue.
It looks like it depends of amount of breakdowns created.
Playing with amount of smooth iterations may solve the issue.
But that is a workaround only if you don’t need smoothing of strokes.
You should fill a bugreport on developer.blender.org