When you have enabled the setting 'deploy processes and flows as active' you need 75% of Processes and Autolaunched flows to have at least some Apex code coverage.
The documentation on Running Apex Tests on a Deployment to Production is not clear whether deploying Flows or Processes will force Apex tests to run, or just rely on previous Apex test runs to determine whether Flows are covered.
Do such deployments trigger running all tests? Do we need to run specified tests that provide coverage? Or does it just rely on previous test results?