@TitiCuisset Thank you for the tag!
@JMayhew6 This is an interesting one. If the deal is being created via a workflow at the exact same time the form is being submitted, could you add a step of a 1 minute delay before the deal is created? Deals would still be created very quickly, in my experience one minute does not make a difference, and it would solve for the two objects being created simultaneously.