https://github.com/LunaPixelStudios/Prominence/issues/376
I don't know whether or not it's caused by some mods in the modpack. I will be appreciated if someone can help me identify what is causing this. Thanks in advance!

Is Source Bucket still present in the modern version of the mod?

If not then this line can be misleading.

Source buckets were removed a while ago. Thank you for pointing out the docs, I will fix that.