Steps to Reproduce:
1 place them like the picture (the piston, sticky piston must cut of the redstone line from above)
2 power it on

Observed Results:
The redstone line under the piston got cut off, but it is still being powered

Expected Results:
The redstone line under the piston shouldn’t powered

Notes:
I don’t know if it is game intention, but the observer and the note block didn’t cut the redstone line off