When the big dripleaf tilts up after tilted state, it uses the tilting down sounds instead. You can hear it clearly after sitting on it and wait to tilt up again. And according to the sound_definitions file, it uses the tilt down sounds.
MCPE-123488
Big Dripleaf tilting up sounds uses tilt down sounds instead
Resolved
Fixed
0
(Unassigned)
500909
Confirmed
Multiple
1.18.10.21 Beta, 1.18.10.20 Beta, 1.18.0.22 Beta, 1.17.30.23 Beta, 1.17.30.20 Beta, , 1.17.41 Hotfix, 1.18.0, 1.18.30.30 Beta, 1.18.30.31 Preview, 1.18.12 Hotfix
1.20.20.20 Preview, 1.20.30
Retrieved
Still not fixed in beta 1.17.20.20, based on the files and testing in-game.