Kelp can no longer be placed on top of kelp, twisting vines on top of twisting vines, weeping vines below weeping vines, or cave vines below cave vines. Instead, bone meal must be used or it must grow naturally. Caused by the fix of MC-278502?
How to reproduce
Place kelp
Try to place kelp on top
Notice that it does not work
Place a twisting vine
Try to place a twisting vine on top
Notice that it does not work
Place a weeping vine
Try to place a weeping vine below
Expected result
You would be able to manually stack these plants as in version 1.21.4.
Observed result
You cannot do it.
Can confirm.