Hi folks! Thanks for your suggestions.
Eric, I’d prefer to keep my patterns as vector shapes so I can resize to my (the client’s) heart’s content.
Chris, it’s definitely the edges of the swatches showing, but I can’t make the issue appear IN AI, so I have to tweak, save, look in AE, make more tweaks in AI, curse at Adobe, check AE, back to AI, dream about moving into a cave and living off the land.
I’m not building these AI files, they are being built and approved by an agency. I’m not great at AI, but I know enough to get it into AE for animating (usually without issue) and make some tweaks with only minimal cursing (until the last 2 weeks with these stupid dot patterns).
After this issue popped up again on a new project, I did another search and found this adobe link: https://community.adobe.com/t5/after-effects-discussions/importing-illustrator-file-with-pattern-to-after-effects-problem/m-p/10897517
Honestly, I couldn’t make any of his suggestions work, so I just brute forced it again by swapping out for an older swatch that worked and resizing it so the dots were close to the original size/pattern. I still haven’t figured out why the patterns I’m getting from this one designer aren’t working while the patterns I get from every other designer in this group do and have for years. (Today’s fun pattern issue showed up as a plain white field in the AI pattern windows, but it’s clearly white dots on red in the file, so I couldn’t even see to tweak it in AI). I don’t know enough AI to trouble shoot it, and this seems to be an AI issue more than an AE issue, so I should probably move my question over to that board.
Thanks again! And if I find a solution that works with my non-AI brain, I’ll come back and share it.