#3599 [BUG] [flytekit-bug] `pyflyte backfill` does not work with custom kickoff time arguments Issue created by kumare3 Describe the bug For an example like this

from datetime import datetime
from flytekit import task, workflow, LaunchPlan, CronSchedule

@task
def tk(k: datetime) -> str:
  return str(k)


@workflow
def example_workflow(kickoff_time: datetime) -> str:
	return tk(k=kickoff_time)


example_launch_plan = LaunchPlan.get_or_create(
    name="example_schedule",
    workflow=example_workflow,
    schedule=CronSchedule(
        schedule="*/5 * * * *",  # Following schedule runs every min
        kickoff_time_input_arg="kickoff_time", # macro magic
    ),
)

OR

from datetime import datetime
from flytekit import task, workflow, LaunchPlan, CronSchedule

@task
def tk2() -> str:
  return "Hello"


@workflow
def example_workflow2() -> str:
	return tk2()


example_launch_plan = LaunchPlan.get_or_create(
    name="example_schedule2",
    workflow=example_workflow2,
    schedule=CronSchedule(
        schedule="*/5 * * * *",  # Following schedule runs every min
    ),
)

Where the kickoff time arguments are either present or absent. Expected behavior It should work in either case Additional context to reproduce No response Screenshots No response Are you sure this issue hasn't been raised already? ☑︎ Yes Have you read the Code of Conduct? ☑︎ Yes flyteorg/flyte