Ben,
You’re at the right place, but you have a real mystery on your hands.
The symptom is that of a bad bulb, but as you know, there really is no definitive way of knowing if an HMI globe is bad, other than observing a visible crack or severe burn marks inside the globe.
For both to die on you at the same time is unusual, but not unheard of. If there was some rough treatment in transit (airplane travel?) it’s possible they both developed hairline cracks.
I’d try yet another (new) globe in each and see what happens.
JS