This will take some explaining. Since long before the better together update I had developed a 2x3 jail cell door. It has double piston extenders that moves iron bars left and right like a jail cell door. With the bedrock codebase this door got significantly simpler since observers can now power blocks.

I decided to also try a comparator decay circuit to power the more complicated side. I experimented with different signal lengths to get the closing mechanism as short as possible which is where I found the bug.

As you can see in the attached pictures the door is controlled by a t flip flop. A sticky piston with an observer generates the opening pulse which is extended to two ticks by the repeater. If the redstone dust is configured more than 10 dust away from the comparator then the pulse decays too quickly causing the crash. If the dust is 10 or closer then the crash doesn’t seem to happen.

The other odd thing is that the game doesn’t crash if the iron bars are not involved. If the iron bars aren’t there then the opening pistons simply don’t fire correctly leaving blocks stranded in the middle of the door.

Another thing that happens randomly is that the pistons, iron bars, and/or blocks on the closing side disappear when pushed by the opening mechanism.