Setting certain Cron schedules throws API errors (but sets the schedule properly)

[znicholasbrown]

Description

When setting a Cron schedule on a flow group from the UI, a list of schedules is sent like this:

[{ "type": "CronClock", "cron": "* * * * * *" }]

but with some valid Cron strings like 0 10-20 * * *, the API throws an error:

Error: GraphQL error: Invalid clock provided for schedule: {'type': 'CronClock', 'cron': '0 10-20 * * *', 'parameter_defaults': {}}

However, the schedule is still set and runs are created properly. It seems this has something to do with parameters being passed to the schedule but I haven't been able to figure out what that could be.

Expected Behavior

No error is thrown.

Reproduction

None at the moment, documenting this so we're aware.

Environment

Prefect Cloud

[dylanbhughes]

it didn't respect the parameter update: https://cloud.prefect.io/prefect-sales-and-operations/flow-run/fc0f5596-b230-4aca-96a7-8b17dfb49013?overview=

[dylanbhughes]

There was a problem creating your schedule, please try again shortly. Error message: Error: GraphQL error: Invalid clock provided for schedule: {'type': 'CronClock', 'cron': '0 * * * *', 'parameter_defaults': {'Email Recipient': '[email protected]', "Emails to CC ('[email protected],[email protected]')": '[email protected],[email protected],[email protected]', 'sfdc_domain': None}, 'start_date': {'dt': '2021-09-23T13:33:58.991820', 'tz': 'America/New_York'}} tried for interval schedule as well