Using mission replay and loading back into a game broken?

Doing a mission via mission replay, which I’m half way though and have various check points / progress saves. Taking a break I used ‘end game’ from the menu so I could do some multiplayer and have come back to play via continue from campaign menu and it loads you back into a fob (with the weapons I had half way through the mission) but all progress lost?? Surely this can’t be right? Is anyone else experiencing this?

Yeah I noticed this as well. Happend twice so far. Definitely not ideal.