Part of this bug was seemingly fixed in MCPE-14710, but in 1.12 (again, maybe?) observers don't detect redstone ore lighting up.
Comments 2
Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Is this still an issue for you? It works for me in 1.14