Observer will not detect the change of contents in chests/dispensers/droppers/furnaces/hoppers/shulker boxes.

When the contents of a container changes, the observer does not detect this.

In previous snapshots, the observer detected when an object is placed in a container. But not anymore, for no reason.

In pocket edition, I think observer downright detects the total content change (block addition in a container already filled for example).

PS: Observer detects the "on/off" in furnaces/droppers/dispenser but not items.