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As a test project, I guess a PCB with at least two footprints is better, one with “normal rotation” and the other which shows the faulty rotation.
KiCad developers are also a relatively scarce resource. If you are sure it’s a bug, then posting directly on gitlab is the most direct approach. If you are not sure whether it’s a bug or features being misused, then posting on this user forum first is a better approach.