The hidden

[Hodge_Hodgson]

Based on the province history - did you sell the province to Portugal?

And from the looks of it, Portugal then declared war on you before the province had finished coring, with the coring finishing during the war?

EDIT: actually, I suspect I found the issue; looks like the "adjacent core" requirement is only updated on certain game ticks, and not on the completion of the core (or even on loading a save)
That's .. not good..

As good a Dev as Wiz was the responses from the Mod's since he departed has been very refreshing. I'm still awaiting some scathing sarcasm to emerge, long may it continue.

 

[Sunspawn]

As good a Dev as Wiz was the responses from the Mod's since he departed has been very refreshing. I'm still awaiting some scathing sarcasm to emerge, long may it continue.

@Wiz?

 

[TheMeInTeam]

Based on the province history - did you sell the province to Portugal?

And from the looks of it, Portugal then declared war on you before the province had finished coring, with the coring finishing during the war?

EDIT: actually, I suspect I found the issue; looks like the "adjacent core" requirement is only updated on certain game ticks, and not on the completion of the core (or even on loading a save)
That's .. not good..

Correct, I sold the province as soon as I noticed Portugal went hostile (by far the fastest method to get a border in many cases, but they won't buy unless "wants your provinces" is active), then they declared, finished the core before landing. In this case I just consoled it to end the war. I couldn't defend that at tech 1, but since they had 12 transports to my post-reform FL of >30 there's no way they'd win landing on that post-reform.