Build with URP on CI missing all textures

I have a game which I’m building via gitlab CI.

When I do so, all of the URP textured objects are completely white (the skybox is fine). This happened on OSX and Windows. Switching to Linear colourspace fixed it on OSX, but not Windows. When I run a local build, both through Build/Build and Run, and through the command line scripting that the CI uses on the build machine, the Windows build has the correct textures.

Any clues?

Here are screenshots of the two apps:

8124137--1053278--with.png
8124137--1053281--without.png