When using slime blocks to launch the player upwards, the player is instead pushed to the side.

This only happens when there are blocks surrounding the slime block placed one block above the slime block.

Expected result:
The player is launched upwards.

Actual result:
The player is pushed to the side.

How to reproduce:
1. Place a piston facing up.
2. Put a slime block on the piston.
3. Place glazed terracotta one block above the slime block (The glazed terracotta should be surrounding the slime block).
4. Power the piston.