In the latest beta of beta 1.18.0.21, the ore distribution has changed for copper ore to match Java, which means it can generate below y=0 to y=16. However, when exploring and removing all deepslate around, deepslate copper ores don't seem to generate at all.

Like MCPE-143902, this is most likely because the replace_rules doesn't include the deepslate block to be replaced by.

Step to Reproduce
1. Go below y=0 on deepslate layer (preferably in a dripstone cave).
2. Try to clear the deepslate and tuff around using these commands, and put it on a repeating command block:
/execute @p ~~~ fill 10~10~10 _-10-20-10 air 0 replace deepslate
/execute @p ~~~ fill 10~10~10 _-10-20-10 air 0 replace tuff

Observed Result
No deepslate copper ores can be found.

Expected Result
Deepslate copper ores can be found.