Telesto with the Enhanced Battery Perk unlocked and selected shows a Magazine of 4 when not equipped and 5 when equipped. Bug persists when looking at the weapon's Details screen- magazine shows as 4 when unequipped, 5 when equipped. This Telesto was acquired as a nighfall reward on a different character. Pictures taken while in the tower.
Xbox One version 2.1.1 (fully updated as of 2/16/6)
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Magazine boosting upgrades don't typically display properly unless they're equipped and you're in a combat area. This started when the 2.0 patch launched. It was never fixed.