Vanilla textures vanished, can't open mod elements that use them

As per title, on 2024.2 with the neoforge 1.20.6 generator.
Have cleared gradle caches and run the installer again to no avail. Fresh workspaces also don't have the vanilla textures available.
Everything builds fine and appears in game as expected.
When opening the same workspace on a different PC vanilla textures appear as normal.