Falling onto a slime block such that the centre of the player is not over it will not trigger the slime block to bounce/negate fall damage (etc.), even if there is no other blocks contacted. I believe that this would be expected behavior if another block is present, but not with air - the only block being contacted is slime.
Reproducing:
Place a slime block above all adjacent blocks. While standing on top of it, hold shift until the centre of the player is no longer directly above the slime block, but you are still standing on the slime block. Use commands (or creative flying) to teleport up 10 blocks or so. There should be no bouncing effect, as if landing on a non-slime block.
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Similar thing occurs with honey blocks in 1.15: if the centre of the player is not over the honey block when falling onto it, even if it's the only block supporting he player when they land, fall damage is dealt as if falling onto a normal block instead of the reduced amount from falling onto honey.
violine1101
Thank you for your report!
We're actually already tracking this issue in MC-1133, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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