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Kind of agree the current title is a bit misleading.

I've never used any editing features in Preview (I mean it's called "preview" so...) and reading the title I thought this meant it was mangling files even by opening them which would have been super scary.

As for non-Acrobat software mangling PDFs after editing... Well that's much less surprising. I've even had Acrobat mangle stuff in PDFs after editing...

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Preview has similar features to Microsoft’s snipping tool. Highlighting, draw basic shapes, draw free hand with a couple colors, and add some annotations. I like it better than Windows most of the time.

Well, technically you at least only have a chance of noticing the error after opening a PDF (again). I suppose that's because after saving the old, correct data is still in memory, but I don't know exactly when the corruption happens – would surprise me if it wasn't upon saving, though.

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