The observer blocks are not working correctly, when I place one of them to look at the other, they do not emit redstone ticks or it is static, and, many times, it does not transfer the signal.  When the beholder is pushed by sticky piston or normal piston, it generates a visual bug where the piston enters the beholder.  The same happens with the redstone comparators, where the redstone should be blinking, but this is not happening.