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Massive explosion rocks SpaceX Texas facility, Starship engine in flames
(interestingengineering.com)
This is a most excellent place for technology news and articles.
IFT3 began to tumble shortly after launch, at least before they opened the "door" where it was obvious. The tumble may have been caused by a leak, and the "reentry" was simply a chaotic mess where the engine(s) began to burn up in the atmosphere, and it was absolutely 100% out of control.
IFT3 finished most of the goals that had been set for that test flight. It was highly successful and they learned a lot that is being applied to IFT4.