I'm not sure if this is a bug or how to properly submit this request but the observer does not detect status change in a hopper in bedrock edition from what I see it does do this on the java edition. Please make the observer send an update signal when when the hopper contents changes
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Agreed that I am spotting this behavior on realm world bedrock 1.12.1 playing on android Oreo 8.1 on LG Q6. I agree this really should be detecting a block update from changes on a hopper block and outputting a signal accordingly. This would seem to be a bug / parity issue oversight.
Have an observer looking at a hopper, power the hopper using redstone, and the observer will not detect the hopper being powered.
I think this issue has been corrected in the 1.14 betas, however i'm not entirely sure.
If it isn't a bug, you can submit the request at the feedback site. I'm sure someone else will give you a direct link....