When I bake lightmaps for a scene, save it, then save as a new scene, sometimes Unity makes a new lightmap folder and sometimes it reuses the old folder. How do I get it to always use the new folder? I try assigning the LightmapSnapshot, but that doesn't seem to take hold, it still uses the wrong folder. Wish they had something about this in the docs.
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if your project is set to serialize in text, you can open up scenes and prefabs with a text editor to your liking. the yaml format should be quite readable, so maybe youll just have to some copy paste fixing..
I have used this on other problems with unity (retargeting animation curves...), but not with the lighting stuff - so it might or might not work.