This issue was caused by the way MCPE-54244 was fixed. It is similar to MCPE-109449 except that it concerns hoppers pushing items rather than pulling items. Just as MCPE-109449 describes the actual disparity that triggered a player to create MCPE-68912, this report describes the actual disparity that triggered a player to create MCPE-94293.

Steps to reproduce

1. Place chest, then a hopper pointing into one side of the chest, and a rail on the opposite side of the chest.
2. Place a chest minecart on the rail and nudge it into the side of the chest.
3. Place an item in each slot of the chest.
4. Place a stack of a different type of item in the hopper.

Expected result

The hopper does not push items into the chest minecart because it is pointing into a container block. It should not even check for container entities when pointing into a container block, both for the sake of intuitive logic and for performance optimization. This is how it behaves in Java and how it behaved in Bedrock prior to 1.16.0

Observed result

The hopper pushes items into the chest boat.
Hopper pushing into container entity bug.mp4