Blue overlays will appear on certain avatars. I found that these may to do with custom colliders and/or GoGoLoco. This invasive overlay will appear on the Avatar menu when an avatar preview is loaded, as well as appear when another user is wearing an avatar that is affected by the issue.

When I wear the avatar affected by the issue, I will not see the invasive overlay, likely because I may be inside of the overlay.

I first made sure that I did not have an avatar overlay enabled on the Action Menu. Every avatar overlay was disabled.

I also checked every Public, and Legacy avatar to see if they were being affected by this bug. Luckily none of them were affected.

Example avatars:

avtr_24288d1f-fe72-4661-b3fd-92bec326cd7e (no GoGoLoco; has avatar flight)

avtr_1572f15f-3bc9-4223-973a-c2d013ea0f1e (GoGoLoco)

avtr_1f72fb9c-6aaa-40b2-aee4-49530237c08a (GoGoLoco)