It happens with normal pistons also
It's a pain as most my cities have gates connected to daylight sensors so that they open and close each day cycle to keep mobs out, now that the gravity blocks break gonna need to find a work around till it's fixed
After a recent update that stated this was resolved the skin still reset after closed and relaunch for my windows 10 install. After uninstall and install the game the problem was fixed.
I recommend completing a full backup/export of all your world saves before doing this. I lost all my saves and cannot find the means to get them back. Windows 10 does indeed delete the folders and all contents entirely when removing the app. I don't know how other platforms manage the saves. Use caution.
I read that you can navigate to the folder of your world save; right click; and select Restore Previous Versions. This didn't work in my case.
my experience with this not only deprived me of all my inventory I gathered from several hours exploring the end; the entire structure I had found and saved in was not where I found myself when I next logged in. I was relocated to a two floor end city somewhere else in the end.. In all my exploring I never once found the building I was in when I loaded the game.
I found once again the mammoth end city I was in when I save and quit to title screen all the cobble I used as scaffolding still remained.
happens to latest 21w15a snapshot with world gen datapack. Severe lag and null biomes.