Not recently but its happened to me three times in total with Monzo, and saved each time by transfering cash over and using my Starling card. The last time was end of Feb for me.
One of those times was the time Asda decided to block Monzo from using their pumps. One was meant to be a Mastercard issue but my Starling still worked, the other time it was Monzo at fault.
I’ve never had an issue with any other bank with Pay at Pumps just Monzo.
Did we ever get an explanation as to why Asda decided to impose a complete block on Monzo, and told staff to put up signs telling people not to use their cards?