-
I only experienced it for the first time recently as well! I put it down to what Mr Otter said about tubeless rims combined with an extremely tough, tyre lever snapping bead on those particular tyres.
Edit: apologies, I forgot about your dislike for tags!
Edit edit: unfortunately those tyres need pumping up to a silly pressure every time they go flat. Makes them a nightmare in a puncture situation with a hand pump.
Success! 120psi for the win. Weird that I've never had that problem before. Thanks!