Lightmap Artifacts at large Y values

Unity Engine
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1

Hi! I’ve got a problem that has been driving me crazy for the last couple of weeks.

I’ve got a project that has a lot of verticality to it, and requires that one of the scenes be placed at a large y value, in this case ~10000. When I do this, the scene’s light map gets all sorts of crazy artifacts in it.

To test this I exported one model to a new URP project, its lightmap looks great at y=0, then I moved it to y=10000 and baked again, the artifacts reappear.

Is there any way to make this not happen? Or is this just something that should not be done in unity?

It looks similar to the problems addressed in this issue: [FAQ] Blocky artifacts appear when I bake a scene. How can I fix them? I tried the double-sided GI solution there, but it didnt seem to help.

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2

OK I spent this afternoon trying to think of different search terms for this problem - I think its this bug:

The work around in this worked for me, a bit obnoxious that I have to apply it to all objects in the scene though.