The loot drops for High Noon are extremely slow. Probably in part because of the drops from the mini bosses as well as Mechanon. You may have had more drops that didn't pop for you quickly and missed them if you left before they appeared.
Did you join the open mission from the start or later in the active fight? I've done High Noon for years without issue, so just speculating what might trigger a partial reward rather than the full reward.
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