Thanks for the bug report.
Most likely Gaia has changed the points by which RWT detects its presence in the project and accesses it.
I will check and get back to you.

I create a vanilla 3D URP project with:
Unity 2022.3.24f1 LTS
+ Real World Terrain 4.9.2
+ Gaia Pro 2023 - Terrain Scene Generator v4.0.5

and I have an error message in Real World Terrain when try to use Gaia Stamps as output. See attached.

I can't figure out the cause. Any idea?

Thanks,
Regards,

Joan