Minecraft 1.13-pre7, Minecraft 1.13-pre8, Minecraft 1.13-pre9, Minecraft 1.13-pre10, Minecraft 1.13, Minecraft 18w30a, Minecraft 18w30b
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
1.13pre-7 : right piston is extended same way as left piston
1.12: right piston pulses twice
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