Sculk sensor reacts to players in spectator mode

Summary:
Sculk sensor reacts to players in water/lava in spectator mode. 

Steps to reproduce:

1. Place sculk sensor.
2. Place water/lava.
3. Switch to spectator mode (/gamemode 6).
4. Walk on the water/lava.

Observed results:
Sculk sensor reacts to players in water/lava in spectator mode.

Expected results:
The player in spectator mode does not have to interact with the world at all (except through commands).