When falling on a slime block moving upward, the player will not take fall damage. However, the player will take this damage next time he/she lands on a block, regardless of how far the player falls after being bounced. See video:
https://www.youtube.com/watch?v=-L-spPdBUaU&feature=youtu.be
MC-67925
Landing on Upward Moving Slime Block Doesn't Reset Fall Damage
Resolved
Incomplete
0
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.