Ref my 'both on same axle'; flying for a ME airline, when we shut down in Khartoum, it was noted that one mainwheel was deflated.
There was only one spare on station and even that was out of date.
So - what to do?
We fitted the spare and went back to base where the job was properly completed.
Was the tyre deflated before we landed? No idea - certainly didn't notice anything landing or taxying.