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Add in a +5 magical bow (with the +1 bane arrow) and the arrow becomes +5 (from the rule of highest enchantment, range weapon or ammo) against everything or +7 vs. specific creature type per the rule of Bane.No matter what happens it’s still a bane arrow and gets +2 better than the actual bonus.
Or....the arrow does not become +5. The arrow is still +1. But when you resolve the attack, you use the highest modifier that applies: +5 vs +3. So the +5 masks the +1/+3 arrow.
You are right it does not become a +5 arrow; the bow bestows the power onto the arrow. What kind of arrow? A Bane Arrow. The bow bestows +5 onto the Bane Arrow.
It will always be a Bane Arrow not a +1/+3 arrow, a Bane arrow. +5 does not erase Bane. Bane is not a modifier, Bane is not an enchantment, Bane is a special ability.