Elder influence doesn't spread to adjacent map after completion.

Hi guys, I'm a bit confused about the specific rules when it comes to spreading elder influence by clearing shaper-influenced maps adjacent to the current elder influence.

This is my Atlas (note: this is after the issue I'm writing about).

https://imgur.com/a/qVJtc

The Villa map there, was Shaper-influenced. I rolled a corrupted rare Villa, ran it and cleared completely. Afterwards, I got the result you see in the link.

Why did the Elder influence not spread to the Villa map?