Coral fans and coral blocks can not be mined instantly (takes about as long as obsidian) and don't drop themselves unless using a diamond pickaxe with Silk Touch. When trying to mine with any other tool other than pickaxe, they can not be destroyed at all. Corals are ok.
Comments 2
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Same here. No matter what tool you use to try and break it, it never has a drop.