Same component, once with reversePaths, once without. This only happens in the variable font, static fonts are fine.
Reversed paths need to have overlap removed. But that can mess with the compatibility of the shapes (I’m trying to improve this right now). Until then, remove the overlap from the “_four.circled” and make sure that all curve segments are actual curves (otherwise they get flattened and introduce incompatibility).
Thank you very much for the explanation.