I tried the command /setblock ~ ~ ~ piston_extension but saw it do nothing. I continued my building in Creative mode and placed a block in the spot I did the command, but It wouldn't let me. There was no block I could break and nothing I could place in the spot.
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Because a block already occupies that spot.
If you don't want this to happen, don't place piston_extensions with commands.
I was doing the command for decoration because in older versions it would work. Clearly it was not occupied because the border wouldn't pop up. If you look no blocks occupy, and their is noting to break.
There is no border because there is no bounding box. The piston extension is still there.
Run the following command while standing in the occupied space:
/testforblock ~ ~ ~ minecraft:piston_extension
And it will return true because the extension is still there.
The screenshot shows where I could still place blocks form above where I was standing (the 2 missing is where I couldn't).