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Some blocks cannot be placed facing a wall with /setblock or /fill + datavalues or block states

Fence gates, daylight sensors, observers, and leaves cut redstone wire as if they were solid opaque

Observer block doesn't detect all block state changes

Placing redstone dust doesn't cause a block update

Observer top texture always faces north

Observers redirect Redstone Dust (but not visually)

Observers are not consistent regarding their opacity.

Observers powering redstone dust below do not power components adjacent to the dust

Pistons are incorrectly activated when adjacent to a block that is adjacent to an activation-power source, but the block is not powered by the power source

Minecraft Observer Block does not update itself correctly

Oberserver block powers air blocks

Observers emit strong power instead of activation power like MCPE observers

Observer activating in odd circumstances

Pistons, droppers, dispensers, observers, & redstone lamps become stuck in an on or off-state & act like solid/opaque blocks until world-reload

Observers are placed with the input facing you (unlike MCPE)

Observers are placed with the output facing you, unlike the Java edition

The pulse of the Observer differs depending on its orientation

Observerblock not detecting update

QC-Observer Block don't update properly

When triggered by comparators Observer gives longer pulse

Observers only emit activation power instead of strong power like in the Java edition

Observer do not update itself

Observers output a signal strength of 15 (Java observers output a signal strength of 1)

Observer inconsistent signal

Observers don't update whatever is being powered through blocks properly.

Redstone clock deactivates after exiting world

Redstone torches, repeaters, comparators, dust and observers update non-solid blocks around/in front of them.

Observer does not detect Blockpowered Redstone updates