I was at my skeleton farm and I noticed that levers, redstone torches, repeater and comparators did not work. I could move the levers and modify the length of the repeaters, but it was just graphics, as the changes didn't do anything. Levers didn't activate redstone and every components behaved like it didn't see the redstone updates around it. I had to break and replace them in order to make them work. This hasn't occured again yet, I think it happened when I opened the world after the update from version 1.13.0.5, but please fix it as I have many contraptions that could still be broken.