The bug is that if you have an anvil and the block under it gets pused back by a sticky piston instead of the anvil falling the anvil breaks. If you have a sticky piston with a random block on top of it and you place a anvil or a sand block or a gravel block it breaks. Due to this bug most Redstone builds have broke. Please fix this as soon as possible. As the video file is to heavy I will give a link to download the video and see what I mean. Here is the link: https://www.mediafire.com/file/kha3wopqxdo5bgx/20200806_103730.mp4/file