Question about progress and changes in the test server

As every time a new test server session comes up, the research progress is reset.
Does this apply to every change made?
Ex. if I equip or unequip stuff from a squad, does it reset too for when the test will become the official and actual game?
The question comes because in the 2nd session I accidentally deleted a theatre squad preset (ex. Normandy/Axis), but in the 3rd session that preset didn’t reappear.
So I’m wondering which changes transport from the test server to the live one.
Thank you, any hint appreciated