Mobile HQ.

[Donvale]

This must be a new thing, or maybe I just never paid attention or encountered one.
However when you encounter a Mobile HQ in a mission...

Spoiler: Minor Spoiler

It raises the initiative of all enemies by one until destroyed

Took me quite a while to work out what was going on!
I notice there are actually quite a few little tweaks like this in some of the newer missions.

 

[Hobbes__]

There are two versions of it. The vanilla, and the one that does what you described in the spoiler section.