Modpack version
1.81

Issue
can't find rock crystal when mining 150 stack of block(coblestone) on bedrock level

Logs
Input pastebin link to crash-report or latest log, if applicable

Have you tried using a Resonating Wand to find them? Have you progressed far enough in Astral Sorcery to be able to see them?

i haven't tried the resoneting wand but i can see then (cofh config change in server 16_andvanced rocetry
)

The intended way to find them is by using the Resonating Wand at night, it helps a lot :)