Large oak trees can grow through blocks that obstruct them, even bedrock. This is detrimental for tree farms. It also breaks bedrock.
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This is a rather helpful bug, but there have been many other useful ones that got removed, like translocation.
Misode
I cannot reproduce this in 20w20b. Do you have more precise steps to reproduce?
Fallen_Breath
For anyone who want to reproduce this bug you can try this tree farm
http://www.mediafire.com/file/erkkmjgwdr63mse/DLHSUTF_v1.0_%2528build16%2529.zip/file
Turn on the farm, switch to oak mode, wait until the flying machine is finished its movement, then hold shift and plant the oak sapling in the farm
Eventually a big oak will grow and "eat" the andesite which is used to prevent bigoak from growing in previous release versions
These two videos shows how it works
https://youtu.be/pu273esW5Dk
https://youtu.be/vSoQ8fLt8iU
MMK21
The benefits of this bug probably outweigh a broken tree farm