This bug is insanely annoying whenever i change my avatar. I always keep 3D mode on but for some reason, the background just transforms into a darker scheme of the current avatar background and 3D changes into 3D.
Here is a video:
As you can see from the video, after i unequip the silverthorn antlers, the avatar editor automatically switches into 2D mode.
I am not sure if this happens to other people but this is a very annoying bug i myself have been experiencing. The bug started around a week ago.
To reproduce this bug, just equip and then un-equip the hat while in 3D mode.