Remove overlap not working on certain paths

So i made an Hebrew version of a latin font, and copied certain paths to the Hebrew characters, for some reason remove overlaps doesn’t seem to work on those paths. I don’t get any bug message or anything and nothing really happens.
thank you.

You are copying paths from a ttf (do you have the licence to do so?), meaning you are copying quadratic curves. Convert the paths to cubic with Path > Other > Convert to Cubic.

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thank you so much,
it’s for a project for school, not something commercial.