Hi Kyle, thanks for getting back to me. I think you're probably correct, as it's never happened (or ever likely to happen!) in real life, I imagine it was overlooked. I have uploaded a save file entitled 'FC Vaduz - League Champs Bug' to SI Cloud Service. Unfortunately, this is a couple of months after Vaduz were crowned champions as I didn't have one before, which I should've made sure I did in hindsight, so apologies for that.
Thanks for your help