I am currently in the 1.13 beta (June 30 2019), the bug seems to have changed a bit. So if someone can delete this post, please do. I am going to make another one with an additional video
Addition:
Observer stops working when logging out more than 5 chunks away
Only works when it is moved using piston or replaced(break and put)
-june 18, 2019. Bedrock version 1.12.0.12 (beta)
The MCPE-33152 was from 1.5, and I didn't experience it in 1.11.
But now (1.12 and 1.13 beta), i experience it.
The world was made in 1.11, so there seems to be no way a resolved bug from 1.5 to be there.