49ers’ secondary could be shorthanded vs. Chiefs

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The 49ers’ secondary may not be at full strength against one of the strongest passing attacks it will face this season.

On Saturday, the 49ers promoted safety Tyvis Powell from the practice squad, which could be a sign starting strong safety Jaquiski Tartt won’t be available when they visit the Chiefs on Sunday. The 49ers released linebacker Terence Garvin to make room for Powell on the roster.

Tartt (shoulder) was limited in practice Friday after missing the previous two sessions and is officially questionable. In last week’s win over the Lions, Tartt aggravated the shoulder injury he sustained in the season…