I have experienced the same bug and attached some screenshots that allow reproducing the problem, though I only had it with downfacing pistons (both sticky and normal).
Edit: Also I tested it in 1.13.2 and there the pistons retract normally, so this was introduced in 1.14.
Lucas Loreggia
I have experienced the same bug and attached some screenshots that allow reproducing the problem, though I only had it with downfacing pistons (both sticky and normal).
Edit: Also I tested it in 1.13.2 and there the pistons retract normally, so this was introduced in 1.14.