The piston turns on itself

1.19.4 I was building a map and noticed this oddity. The piston was activated without any signal. At first I thought that the block on top could have activated the piston due to a bug, but after breaking it I realized that the piston was activated even without it. ATTENTION FOR MODERATORS: NO MODS WERE INSTALLED THIS WAS THE OFFICIAL LAUNCHER AND PLUGINS ALSO REGULAR VANILLA MINECRAFT