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Resurrecting this topic because I think I've found the solution.

I was getting a lot of this in the log:

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System.NullReferenceException: Object reference not set to an instance of an object
  at RimWorld.Planet.World.WorldPostTick () [0x00000] in <36108d57f84d49cabdae818c2a53fc38>:0

I found through some debugging that gameConditionManager was null. I confirmed this by cracking open my saved game and looking for the line:

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<gameConditionManager IsNull="True" />

Using a fresh saved game as reference, I replaced the line with this:

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<gameConditionManager>
<activeConditions />
</gameConditionManager>

This allowed me to once again interact with the world map and cleared up the log spam.