I already made the bug report. However, I thought some of you might love to cheese out so sharing it here.
Recommended: Emperor of China - Wide range of countries can become EoC and EoC can declare force tributary on all border countries.
Majapahit - 'Subjugate the Mainland' mission allows you to use force tributary exploit on every possible country regardless of sharing border or not.
When you're attacking an enemy country with a small ally, open a peace deal window and do follow things: (In the below example you're Ming and the main enemy is the Oirat, and the enemy's small ally is Sarig Yogir)
1. Demand a small ally to be your tributary
2. Take a good chunk of the main enemy's land
3. Demand the main enemy to be your tributary
4. Cancel small ally tribute demand.
5. Cancel main enemy tribute demand.
6. Check your starting peace offer value. and repeat 1~5 any time as you want.
That's all. Happy lemon juicing
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