Prefab lightmaps are not created at all

[LuckyChickens]

When using this script, it doesn't seem to generate any data at all, as the lists within the script remain completely empty after running it. I have attached the script to the root of the prefab, and the prefab is set to static. I am using URP, realtime global illumination.

[LuckyChickens]

I should also note that I am on Linux, if that helps.