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The official statement has been released:

Bad things happened to a good asteroid grain, but not on JAXA turf 😐.

(And therefore, the asteroid Ryugu sample--aside from that one grain that died on the mean streets of London--that was returned by the Hayabusa2 mission is still free of contaminants from the Earth environment.)

https://www.isas.jaxa.jp/en/topics/003899.html