Using 'Divide' Pathfinder action produces unexpected/incorrect results.
Seems there is a bug in Pathfinder in Illustrator 29.7.1. When I use the 'divide' setting, it produces incorrect/unexpected results. Seems to be a new issue since upgrading.
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Strange... If you still have a copy of this original file — can you share it here, please?
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Anders Alexander commented
So I think my file was corrupted. I work in Adobe PDF format files and I saved it to an .ai and back to a .pdf and the issue seems to have resolved itself.