The pulse of the Observer differs depending on its orientation

When the Observer block is oriented vertically (down to up or up to down both) the redstone dust at the output side is not transmitting to a repeater behind a block. (all other orientations work properly)

related with MCPE-16170 and MCPE-11871

There is some screenshot which will help:

• on the one call correct.PNG I break a block on the right side and all work well.
• on the other one I break a block above the Observer and the repeater don't get the pulse trough the block (unlike the first case).