Hi im not sure if this was already posted but
when i save my game in campaign, lest say gamma mission 1 and then load it, my already researched upgrades are gone but only partly for example i researched the chaingun and i can still build units and turrets with the chaingun so this upgrade is not gone after loading BUT all Damage and Attackspeed upgrades for the weapon is gone before i saved my chaingun had 750 attackspeed after loading it has 138 also the dmg is lower this is the same for ALL other weapon systems And for all vehicle armor upgrades and all building armor upgrades maybe even other upgrades but these are the ones which i can check in the design screen