Disappearing agents

[Feanaro]

Playing as Maratha I've been having my Thugee's disappear. Not assassinated, not caught spying or sabotaging either. No message to report any mishap is received. I believe it happens when I used them to infiltrate an enemy army, Mughals, before I attack. If I wipe out the enemy army apparently my Thugee perishes also. Anyone else notice this?

Do they still appear on the units list? I once had a Cherokee army go... missing somehow. With my rake. I checked the unit list and found my agent sitting inside an invisible army. I was able to move him, thankfully.

[Hosakawa Tito]

No they disappeared from the list too.

[Quillan]

So far, every rake I've had in a city that fell was killed in the fight. However, I did get the message after the battle. Twice it was my infiltrator who died when I captured the city, once I had infiltrated a neutral city that was attacked by and fell to a third party in the following turn. In all three cases I lost my agent.

Now, I haven't yet had a KGB agent (Gentleman stealing tech) in a school that got raided, so I don't know what happens there.