After completing the game, I spawned back in the lift that leads to the last story mission. A dialogue pops up telling me that I have earned some completion rewards. Happily, I skip from the lift and bring up my inventory to find no rewards at all, in fact, it's worse than that, I have literally lost the last two hours of experience and items.

I reloaded from previous save and run the entire last mission again from the lift onwards. Same thing.

It's been a tough time getting to the end...

No end game rewards or progression.