SANTA CLARA — It wasn’t the greatest of practice sessions Wednesday for 49ers quarterback Mac Jones.

He had a pass intercepted by Derrick Canteen when it appeared he and receiver Russell Gage Jr. were not on the same page. Jones overthrew rookie Jordan Watkins on a post. Had passes broken up over the middle on some 49ers’ bread-and-butter crossing routes.

Jones wasn’t nearly as efficient as starter Brock Purdy, which is understandable.

Just another day in a June no-contact practice where the 49ers’ backup for their $265 million starter is learning the ropes as a valuable insurance policy. Mick Lombardi, the 49ers’ quarterbacks coach, was in his ear.

“Today was a little bit shaky for me, but that’s how practice goes,” Jones said. “My goal has been, every attempt should be committed to t

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