When a shulker box is broken by a piston, the entities have weird, unreliable physics.

To reproduce simply break a shulker box from the side with a piston, as seen in the image.

Expected result - The broken box entity gets pushed by the piston into the hopper on the left reliably.

Observed result - about 1/30 shulker boxes shoot up and get stuck on top of the surrounding blocks around where the box previously was.

This prevents bedrock players from having small reliable shulker box loaders. There are designs that help partially prevent this, but even with their massively larger size this bug makes it nearly impossible to make a 100% reliable, tileable shulker loader.

The second image is a popular design thats made specifically to counter this bug, yet it still losses nearly 1/5 boxes.