^{Update by Mega_Spud:}
Summary:
The north and west edges of slime blocks are not bouncy if they have another block next to them (including water, slabs, but not other slime blocks). This means that the player can take fall damage when falling onto slime blocks unexpectedly.

Steps to Reproduce:

1. Place a slime block in water (so that the top is not submerged)
2. OR place a slime block on the ground and surround the block with slabs
3. Jump on each of the four edges of the slime block

Observed Results:
When the slime block has a block next to it (including water) the north and west edges are not bouncy, and the player can take fall damage. (Stone particles and sound can be heard)

Expected Results:
Slime blocks should stop the player receiving fall damage, even when there are blocks beside it.

Screenshots/Videos attached: Yes

Notes:

Original Description:
Playing in survival on minecraft xbox live. 

When you jump on a slime block close to water.

Only two of ridges and center make player bounce on.

Two other ridges have the strenght of a stone. That make us die if jump from high place.

Check my video