Bouncing on the edge of slime blocks is axis-dependent

The bug

In order to reproduce i aligned two armorstands

so they both land on the birch block and the slimeblock at the same time
while the center of their hitbox is above air
Both are aligned in diffrent directions

Expected behavior : Both behave the same

Actual behavior : one jumps on the slimeblock, the other one lands on the normal block

I attached a video showing this problem in action

How to reproduce

1. Place an upwards-facing sticky piston

2. Place a slime block on top of the pison

3. Run the following commands while standing on top of the slime block:

   /setblock ~-1 ~-1 ~-1 birch_wood

   /execute align xz run summon armor_stand ~-0.2 ~ ~0.2

   /execute align xz run summon armor_stand ~0.2 ~ ~-0.2

4. Place and press a stone button next to the piston
   → ✔ The armor stands are launched into the air
   → ❌ One armor stand continues to bounce on the slime block, while the other does not (inconsistent)