That's strange, but the rules may well have changed recently. I had a Class 2 medical and was on Metformin. I was told that I could get a Class 1 but that it would also have an OML restriction on it. At the time I was wanting to instruct so actually it didn't make sense to go for the Class 1 as I could still instruct with my Class 2 as a PPL and not get paid.
kui