If your minimum night stay is not transferring over to Booking.com you may need to tell Booking.com that your "child rates" should "follow" the rates on the "Standard rate".

Host Tool's "Minimum Night Requirement" field maps to Booking.com as the "Min. stay from arrival" restriction. By default, this restriction's field is not visible in the Booking.com calendar, but a customer support agent can expose it on request.

Then, the agent needs to have the restrictions for all rate plans follow the restrictions set for the "Standard Rate" plan. Any rate plan that is not the "Standard Rate" is known as a "child" plan, not to be confused with special nightly pricing for child-age guests.

Booking.com has told us specifically to:
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"Advise the client to contact our Customer Service Team to set up those rates to follow restrictions from the standard rate. That will resolve the problem since all the restrictions that you set up on the standard rate will then reflect on the other rates."