'Tis not a problem report rather a question: as I continued my ironman run started I guess in 1.30.1 (Switzerland), besides still continuing to be Ironman, I saw some cores vanishing from provinces (like Verona or Toulouse) as I went with the intent of claiming those provinces and release those vassals, and this happened around 1600..
Is this WAD or it might have been an issue due to the incremental patches?
Cores can expire if the nation doesn't own the land and hasn't recently fought a war with the nation that owns it. It takes from 50 to 150 years depending on how closely the culture of the province matches that of the tag whose core is in question. The exception is that the primary nation of a culture will never lose a core on a province of that culture. Thus, cores of every nation that doesn't exist at game start will be lost no later than 1594 if the nation never exists and is not the primary nation of the culture of the province(s) where it has cores. Nations that exist at game start but disappear quickly would also lose such cores around 1600 as you are seeing.
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