Hello! I wanted to inform you about a bug in minecraft called: Flying sand, lava and water. If you take a piston, a lever, obsidian, two slimes, and also take what you want it to fly, for example, sand lava or gravel, etc. Also this bug works from version 1.16.5 - 1.17.1. Conclusion: the bug is already old and needs to be fixed. Best wishes, Maxim. Wish you luck
Bye!