The silver ore replacement has a light level of 14, where the normal ore has light level 4

This seems to have been a bug with all light values being set too high when background imitation is disabled. I have fixed that in 4.6, which will be uploaded by the end of the night and should get approved by Monday.

I'll check this again in 5.1 and verify it's been fixed.

This is still an issue as of 4.6