IMO, a valid TO request makes the ball dead as soon as it's recognized as valid. If the whistle doesn't come until after the request would otherwise be invalid (try in flight, or a turnover, or the new offense gets the ball at their disposal for the throw in), we make it retroactive. If the whistle comes after a violation (airborne player or 5/10 second count) we make it retroactive. Yet we never go back and fix the clock, so yes, it's a bit inconsistent.
Your OP isn't that difficult, though, as the rule is pretty clear that the ball doesn't become on any whistle for action that occurs during a try for goal.
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