I integrated Betazed and its starbase wouldn't connect to trade network. It wasn't even showing on trade collection range. Waiting didn't work, downgrading the starbase and upgrading back did help, but that's not how you want to tackle this. Then I tried saving the game and reloading and it worked (Started as disconnected, but connected after unpausing the game). Integrating empire should trigger trade route reset and recalculation.
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