Pistons facing upwards with a Redstone Block that are activated with a sculk block will remain stuck.

If a sculk block is used to activate a piston facing upwards with a block, when the sculk block turns off, the piston remains stuck in its activated position until the sculk block is removed.

This does not affect a piston facing sideways or upside down.

Update: I can confirm this indeed affects Redstone Blocks. Testing this on other blocks does not affect it at all.