A piston breaks gravity blocks such as concrete powder or sand when powered twice with one tick pulses

What I expected to happen was...:
The piston extension should have lifted the falling block (1.14.1 tested)

What actually happened was...:
The piston extension broke the falling block (concrete powder in my case)

Steps to Reproduce:
1. lay down a piston, facing upward
2. place gravity affected block on top
3. put two observers facing each other (1 tick clock)                                                                                                           4. connect the piston to one observer output

The block will normaly be lifted, then fall when the piston gets retracted, then break due to the following piston extension.

Thank you for such a game, you're all doing a great job. Wish you a merry december, and some relaxing time after 1.15 release.