[GS] How can a barbarian settler be in an AI encampment?

Russia could easily capture it I guess, but I cannot.

 

No idea what exactly happened in your case, but I noticed civil/support units persisting in enemy cities or encampments as well:

[NFP] - [1.0.5.11] GC / Support / Civil units stay in encampment or city when flipping independent | CivFanatics Forums

 

Thanks for the info, it's similar yes, but in this case I don't think there was any city flip involved, as the encampment belongs to the capital of Russia, I would have noticed it I think.

(it's still there 40 turns later)

 

Ticket #8305644 : [GS] How can a barbarian settler be in an AI encampment?