The San Francisco 49ers fell victim to an upset in Week 4. Even with Brock Purdy returning to action from a turf toe injury , San Francisco was upset by the Jacksonville Jaguars at home. The loss ended the 49ers' bid to stay undefeated this season.

It was a close contest, as the Jaguars won by just five points over the 49ers. After the game, 49ers head coach Kyle Shanahan revealed what the refs told him about a crucial call in the game. In the second quarter of the game, the Jaguars were pinned at their own nine-yard line. On second-and-12, two flags were thrown following an incomplete pass: offensive holding on the Jags, and a personal foul on 49ers cornerback Upton Stout.

After some discussion, the flag on Stout was picked up. As a result, the Jaguars had to replay the down with

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