The only thing cited (in this article) is:
> An anomaly occurred during the ascent and prior to stage separation resulting in a loss of the vehicle. No injuries or public property damage have been reported. The FAA will oversee the mishap investigation of the Starship / Super Heavy test mission.”
Which is normal - I'd expect nothing less. You'd be crazy to allow further flights (of anything) until you have a full understanding of what happened.
But of course, that doesn't have the same nice sting as "grounded indefinitely".
[0] https://www.politico.com/news/2023/04/20/spacex-starship-exp...