I'm guessing the police have a problem with the way the jurisdiction is stated in the bill. It's a confusing mess. It's defined in both the Civil Code of Procedures (CCP) and the Penal Code.
"(c) The special maritime criminal jurisdiction of California
extends to acts or omissions onboard a ship outside of California
under any of the following circumstances"
Then the bill puts a long list of cirumstances. But this seems to say if an act or omission occurs on the ship in a Mexican port then California may have juridiction. This may cause a workload increase and additional costs to the Sheriff and CHP.