Warped/Crimson Fungi can break Bedrock

Warped Fungus and Crimson Fungus grown under any block will cause that block to break and disappear forever the picture below is an example.

Notes from MCPE-65757
At y=121, you can place warped/crimson fungi on their 'dirt' blocks, using bone-meal, they will sometimes clear out some bedrock blocks above them. Another way to fool it is putting warped/crimson blocks between the fungi and the bedrock and it let's it grow still.