I guess that Minecraft won't detect whether there is a block above the Oak Sapling anymore but only a detection based on probability. So it won't prevent the Oak Sapling grow into a Large Oak Tree if any blocks exist above it, and if so, the Large Oak Tree will replace the block no matter what is it, even the Bedrock
MiKayule
MC-177251
CompBug-20w09a.png
Confirmed for 20w09a
Confirmed 20w10a
It is the same as
MC-183809, but have less information hereConfirmed 20w17a, 20w18a, 20w19a, 20w20a and 20w20b
I guess that Minecraft won't detect whether there is a block above the Oak Sapling anymore but only a detection based on probability. So it won't prevent the Oak Sapling grow into a Large Oak Tree if any blocks exist above it, and if so, the Large Oak Tree will replace the block no matter what is it,
even the Bedrock