Observers are missing their cooldown.

Observer can power directly after the tick it already power, sending a constant power if made to update every tick

This is a huge flaw and it breaks about 80% of doors

Example:

1.13pre-7: piston is powered for 2 ticks (4 gameticks)

1.12: piston is powered for 1 ticks (2 gameticks)



Example 2:

1.13pre-7 : right piston is extended same way as left piston

1.12: right piston pulses twice

Example 3:

part 1: Piston

1.13pre-7: Piston is constantly powered

1.12: Piston pulses

part 2: Dust behavior.

1.13pre-7: the redstone dust never unpowers

1.12: the redstone dust turns on and off

+ observers powers more times/minute in 1.13pre-7 compared to 1.12