You cannot place Dead Coral Fans (or Coral Fans underwater) on the underside of blocks.
I was expecting that coral fans could be placed on all sides of blocks.
Steps to reproduce:
Attempt to place Coral/Dead Coral fan on the underside of a block
Observe the coral fan does not place
Comments 2
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This is not a bug, it is a feature request. You're asking for the addition of hanging coral fans, while they were never said to be added, planned, etc.