One wonders if there is a secret plan to give Gibraltar to Spain.
Gibraltar is too important for the UK to just give back to Spain like it did with Hong Kong.
Spain is not as powerful and influential as China so Gibraltar stays with the UK. I don't think EU will do something different.
However, it is strange, that 3+ years after the referendum, you still have no exit plan.
I have the feeling, your government doesn't want to leave, you are trapped in EU and you just delay it.
There are still many influential leaders and politicians in the UK that wanted to stay with the EU. Before there were even plans of a re-vote and that the second one won't be including the whole populace.