[issue39725] unrelated `from None` exceptions hide prior exception information

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[issue39725] unrelated `from None` exceptions hide prior exception information

Nick Coghlan added the comment: Tweaked title to be "hide" rather "lose" (all the info is theoretically still there in various places, it's just hidden by the default traceback printing machinery, and hard to extract from the exception tree). Issue #18861 is the original report of this probl