On the left side of the image you can see the HUD bingo card with the old item frame texture. On the right is the actual item frame item which uses the correct (new) texture.
Tested in Minecraft 24w12a with Fetchr 5.1.2 Pre-Release 1 and seed 1758866993.

Do you know when the texture changed?

Looks like in Minecraft 1.18.

To be honest, I can't tell the difference, but according to the wiki...

Ah yeah nice, if it changed last before original 1.20, I can just apply it without any overlay shenanigans.

Thanks!

According to https://minecraft.wiki/w/Item_Frame#History there have been zero changes to the Item Frame in 1.20