When mining a coral / coral fan with any silk touch tool, it will drop as an item.
However, when mining a dead coral /coral fan with any silk touch tool other than a pickaxe, it won't drop anything.
Linked issues
duplicates 1
Comments 2
Thank you for your report!
We're actually already tracking this issue in MC-135783, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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Does MC-135783 describe the issue?