When trimming an offset path, the lines make a visual blip, but it's inconsistent. I'll attach a picture so you can see.
The lines cutting through the circles, seeming to outline the wedge left by the trim, would hopefully not happen. Seems to only happen at regular degrees like 90, 180 etc when trimming circles and the like.
Thank you for posting about this issue, I see the lines as well when I create a similar setup. We are now tracking it internally as DVAAE-4214497. Stay tuned to this thread for updates or check inside the What's New panel ( the new flask icon in the upper-right corner of the AE interface.)
Cheers and thanks again,
- John, After Effects Engineering
This should now be fixed! If you have an old project, you may have to purge the cache to erase the disk cache.