Minecraft is v1.16.100 Bedrock, in Realm.

BUG:

When attempting to remove various blocks out of a chest that is placed under a furnace/hopper setup, blocks automatically jump back into chest as they are placed into player inventory.

So far, i have only encountered this on my Realm, I have not tested if it exists in a local game.

Update: I have tested this on a new local survival mode, and issue does not occur.

Attached is a small video showing the issue, and a photo showing the setup I am using.

Any other chest functions as normal.

Update #2: This issue seems to have automatically corrected itself when playing in my realm. Hopper chest is working normally again.