Doors, trapdoors, gates, and buttons won't open/active when you are crohcing. Their block states won't change because players are crouching.

To reproduce
1. Place doors, trapdoors, gates, and buttons
2. Crouch and try to open or use those blocks

Note: Buttons don't give off redstone power when crouching. The door won't even move when the players are trying to open the door while crouching, the blocks does change their block states for a second and returns to the same position that they were before. I wasn't even closing and opening the doors, gates, and trapdoors really fast though.