obj model texture mapping issues after porting to 1.20.1

[Avern]

I'm porting my mod from 1.19.2 to 1.20.1 and ran into an issue with textures applying incorrectly to all my obj models. All models were exported from blender with default settings. Did something change with the obj loader?

Any help is appreciated, thanks!

1.19.2 on left 1.20.1 on right:

 

I made a test cube, each side a different color. The top and bottoms (green and yellow faces) of the cube are black ingame:

Edited July 15, 2023 by Avern

[Avern]

Looks like I found a fix, I just need to vertically flip all my textures... Why do I need to do that in 1.20 and not 1.19? No idea.