Multiple schedules in a trigger

Build Environment
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I want to run workflow every 2 weeks on Monday, and wanted to use a cron expression “0 1 1-7,15-21 * 1”, which is not supported in CircleCI.
Then I split the expression into 2 parts like below, but the workflow does not seem to run.

I want to know the reason why, maybe my cron expression is partially unsupported or multiple schedules in a trigger is unsupported.

workflows:
  version: 2
  biweekly-build:
    jobs:
      - build
    triggers:
      - schedule:
          cron: "0 1 1-7 * 1"
          filters:
            branches:
              only:
                - master
      - schedule:
          cron: "0 1 15-21 * 1"
          filters:
            branches:
              only:
                - master