There is no blanket "1's always fail" rule - it would particularly suck for Characteristic Tests (where a 6 is an automatic fail and a 1 is an automatic pass).
There is a rule that applies to Armour, Cover and Invulnerable saves only (p38, Maximum Save). So unless the rule states a 1 fails (BotO doesn't have such a restriction), then it's possible to automatically pass the dice roll.
Not really game-breaking on the BotO, but particularly frustrating on Feel No Pain (which "isn't a save" and so the above mentioned rule doesn't apply to it).
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