After flying around below bedrock level on the new 21w15a snapshot, I found a patch of deepslate that generated on the bottom level of bedrock
MC-223188
Minecraft 21w15a deepslate generating on y0
Resolved
Duplicate
0
John Paul Delabruere
(Unassigned)
Unconfirmed
(Unassigned)
21w15a
Retrieved
It's smooth basalt, not deepslate. Duplicate of MC-203867.