Question about Sovereign Color unlocks

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This is definitely a very specific Wonderstruck developer directed question.

How does newly “unlocked” colors get to other game servers? We noticed something interesting today where the last “new” Sovereign world today was at 2020-10-13T20:10:00Z. We checked the colors about 20 minutes later at about 2020-10-13T20:34:00Z. Then we checked the colors again 4 hours later at about 2020-10-14T00:32:00Z and there was 24 new colors.

We did notice the two worlds were in two different regions (US West vs. US East) and there was obviously about a 4 hour difference.

Is there some type of delay that requires new colors to be synced across the game network that would account for the delays in new colors we saw? Or are newly unlocked colors synchronized right away?