It sounds as if captured workers may not actually show as additional citizens in a city that they are ordered to join and remain as 'foreign nationals'. But then in what way are these foreign workers actually helping city production?
Thanks for info, but actually that was not my question.

They simply disappeared while trying to join city, no pop or shield boost...
#2 is likely there was a hidden unit in the stack. You usually can hear them making sounds. There are many types of hidden units in the mod (Mullah, Lawyer and so forth).
I forget the deal on the workers as I had not tried to add any as they are too useful to add.
Nice. That wasn't on my mind, it just happened few times, maybe too much coincidence, I'll try again.
Yeah, makes sense (worker thing).
While I am here, I'd like to add few things, maybe as improvement if you like them.
Now, I am playing with Russians. Just some minor game feature.
Madge, that plane that is moving through water - upgraded from heavy coastal battery has some "problems". First of all, it has two bombard options, one with range 2 and second with range 3. I guess one with range 3 is extra since I never managed to hit someone on that distance.
Also, isn't bit strange that torpedo can bombard even land units? I was just thinking...
First bombard airplane that is available for Russia is Sikorsky Mourometz V (120 shields) and it has absolutely same characteristics with his modern upgrade Tupolev SB-2 (140 shields) and it even costs 60 gold to upgrade. That was also strange to me.
Alpine troops, cheering with Nazi swastika when they get promoted? Not in my Russia

Maybe that small wonder shouldn't be created within all nations...