Although the place bounces when jumping on a slime block placed at y level 0 or above, jumping on a slime block placed at y -1 or lower is no longer bouncy. It’s just like jumping on any other block.
MCPE-121774
Bouncing on Slime Blocks and Beds doesn't behave correctly below y=0
Resolved
Fixed
15
(Unassigned)
491853
Confirmed
Multiple
1.16.230.56 Beta, 1.16.230.54 Beta, 1.16.230.52 Beta, 1.16.220.52 Beta
1.17.0.50 Beta
Retrieved
affects 1.16.230.50