Pistons get powered by block updates nearby, sometimes even if the redstone block was removed

 Hi, I was trying to build something with redstone but something wierd happends. What should happends if you break the white wool block?

 

 

Here is a video with the answer:

https://youtu.be/TKmem9gvELk

Expected behaviour

The pistons actually only should have to be powered if they get a redstone signal.