I:R - Sieged city becomes unowned and doesn't count towards occupation

[JonathanPB]

Description of problem
Sieged city becomes unowned and doesn't count towards occupation

What platform are you playing on?
Steam

What game version are you running?
1.00

Please select any/all DLC you have enabled.
Hellenistic world flavor pack,
Epirus flavor pack

Do you have mods enabled? No

Please explain your issue is in as much detail as possible.
Playing as Macedon, was conducting an initial war with Taulantia and sieged down the capital Epidamnos. At some point soon after (not sure when) Epidamnos stopped being part of Taulantia and instead became unowned by any country, no longer counting towards occupation of target province.

Steps to reproduce the issue.
Start as Macedon, invade Taulantia, occupy Epidamnos?

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[Dargaron]

Quill18 ran into this (or something similar) in his Kush campaign: basically, he abducted the last factional pop and the province became unowned. Could that be the case here?

 

[Katzura]

if all pops in a city go away (either as taken slaves or die) the city will become uninhabited and will not belong to any country, therefor also not being part of the war.