I've checked similar questions, but I feel this one is a somewhat different.
Suppose someone signed a contract saying "you must not do A, but you must do B", and some time later it turned out that A and B were the same. Is there some settled understanding of how this may be ruled upon (no particular jurisdiction in mind)?
For example, you signed up to a Joe's Fried Chicken franchise and the contract said you must not use KFC 12 secret spices, but you must use these spices A...L. Unbeknown to you these turned out to be the 12 KFC spices. Perhaps even instead, you did know that the spices were the 12 KFC spices.
Given that you were instructed not to do A and must do B, and A and B are the same, are you free to ignore A and do whatever you want (since A is B), or are you bound to do B since you might not have known that B is A? Might you be asked by a judge to explain why you didn't seek clarification due to the conflict in the contract if you did in fact deliberately choose to do A?
Does it matter if you know A is B and you are using that information to do whatever you want?
This actually did occur in a contract a family member is involved in, but I'm leaving out the circumstances just to get a general idea of how contentious this might turn out to be.