P1S with AMS2 Pro: Color slicing seems wrong?

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Hi, I’m trying to slice a 3mf file that I resized and colorized based on the following model:
https://makerworld.com/en/models/1974273-3d-background-savannah#profileId-2123206

It’s split across two plates and I have it set to use my Bambu Lab P1S Printer that has an AMS2 Pro attached. I tried printing this model earlier and had to cancel the print early on when I realized I didn’t have the infill density high enough (it’s an aquarium background, so I need high infill so it sinks instead of floats). That failed print was of the second plate, and was using both colors and showing correctly on the slice confirmation. I printed some other PLA models for my daughter after cancelling that print, and this time it seems to not be using both filaments…

When I go to print the summary slice page shows what I’d expect, with my 2 different PETG filaments used and the approximate volume I’d expect.

The first plate correctly shows 2 filaments being selected from the AMS with the correct slots listed. But when I go to print the second plate, the slice results screen is only showing the first filament used with zero color changes? Note that the thumbnail of the second plate correctly shows 2 colors…

Any idea what I’m missing here?? I’ve started printing the first plate for now since it’s going to take close to a day to print that part, but I’d really like some clue why the second plate isn’t slicing right before the first finishes…

Ok, found the problem and leaving this up in case anyone else runs into the same issue. Somehow, for just the object on the second plate, the “Purge into this object” option had gotten checked. I have NO idea how, but hey, at least I solved it before I had to try to print the second plate!

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