Greetings Sir/Mam

The Summary:-

This bug has been presented in the Java Edition where the observer does not get updated when the fence has connected to a full grown tree. This same bug is now presented in the Bedrock Edition.

How To Reproduce:-

Step 1:- Place a Observer Block.

Step 2:- Place a Redstone Lamp in the red dot of the Observer.

Step 3:- Place a fence in the Observers Face.

Step 4:- Place any block to connect the fence/bone meal a sapling.

Observed Results:-

The Observer does not get updated when the fence is connected to another block or when sapling is full grown into a tree.

Expected Results:-

The Observer should detect the update.

Hoping this information is helpful to fix the bug.

Thank You.