Scenario help - unit placement in cities and change of owner

Hello fellow cartographers,
what exactly happens when a city is taken over by an opponent but the scenario's events have units spawn in that city on later turns?

Example:
Player A and B fight a 1v1 in a scenario, they both own multiple cities. They both started with predetermined countries. Thus, player A i.a. started with a country that has the (capitol) city "Capitol".
The scenario spawns one unit in "Capitol" each turn. (unit owned by player A)
Player B captures "Capitol".

What happens to the units that would be placed in this city for player A on upcoming turns? Do they get placed beside the city? Do they not spawn at all?

Have you tried to do it in a scenario, I could help if you want