this looks like Apple fixed it. It now works for me.
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also, this empty array is generated by Xcode as soon as you add/remove health kit.
I deleted the entry (the empty array com.apple.developer.healthkit.access), but after upload, I received the message : ITMS-90000: This bundle is invalid - $message. very weird
I had the same issue today starting at 3PM eastern time (jan 13) I opened a ticket at Apple, but they send me back to Xcode documentation and WWDC videos on automatic signing. I had also uploaded 1 or 2 builds earlier this morning on TestFlight without any issues.