Playing in the newest snapshot and found the following bug:

Redstone contraptions that rely on activation and deactivation of pistons 2 blocks apart that face eachother with a single block inbetween (for example, the famous etho-hopper clock that has two pistons pushing a redstone block into eachother) fail to correctly sync their activation/deactivation.

In the case of the hopper clock, once the clock switches and one piston deactivates, the other should simultaneously activate. Instead it fails to push the block in front of it and gets trapped in a BUD-like state where it is powered but doesnt activate until it is updated.

The bud state result is visible in the image i added. Reproducable by replicating the shown build. In the example i have 5 blocks in one of the hoppers. After a hopper empties once, the system gets stuck.