Really many machines stop working at BE due to the lack of this system. Several, doors, farms, flying machines, fantastic miners stop working without mentioning some ways of compacting circuits. As soon as I can I will vote for this poll.
They are two sticky pistons. However, the machine I showed
works in Java Edition, even with two sticky pistons, and on top of
that it can walk in two directions! In Bedrrock Edition, you can only
make flying machines that fly in one direction. This machine should
also work in Bedrrock edition, as well as in Java.
Unfortunately I was able to verify that, in fact, the problem still persists in the current version 1.16.40.02. The machine is composed of 4 slime blocks, 2 observers and 2 sticky pistons and is activated by a tick on one of the observers.
• 1 - What happens is that, when it is activated, the machine moves in two directions in a random and unpredictable way;
• 2 - What should happen is that the machine moves in a straight and uniform way in the opposite direction from the observer used to activate it.
In Java Edition, this simple machine works perfectly because there is alternation between the sticky pistons: while one pulls, the other pushes. In Bedrrock Edition, it doesn't work as it should because that switchover doesn't exist.