Bug at end of Haven Defence mission

Just completed a Haven defence mission (anu) early game. I get this screen at the end which will not respond to any button clicks (end, Scrap or spend all that tech for some reason!) and if I escape out of the screen, sends me back several hours of game play to a previous save state.

Bit of a shame to loose all tha game time. I guess I’d better learn to quick save more often

Edit: I’ve just checked and while my research options have reset to the early save state, I have the weapons I have unlocked and built (like the grenade launcher) equipped on my soldiers.