When bone-mealing a weeping or twisting vine repeatedly then breaking one of the blocks in the vertical chain, the vine disconnects in the middle and will be supported by nothing.
Screenshot/Video:
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MC-278502
Weeping and twisting vines disconnect
Resolved
Fixed
3
Confirmed
Platform
Normal
Block states
1.21.3, 1.21.4 Pre-Release 1, 1.21.4 Pre-Release 2
25w02a
Retrieved
Confirmed, however this seems to be the same root issue as MC-188626 and/or MC-197710