The first scheduling interval is executed twice in backfills from the UI

[anna-geller]

Describe the issue

reproducer:

id: backfill_test
namespace: company.team

variables:
  file: yellow_tripdata_{{trigger.date ?? execution.startDate | date("yyyy-MM")}}.parquet

tasks:
  - id: label
    type: io.kestra.plugin.core.execution.Labels
    labels:
      file: "{{render(vars.file)}}"
      
  - id: log
    type: io.kestra.plugin.core.log.Log
    message: file https://d37ci6vzurychx.cloudfront.net/trip-data/{{render(vars.file)}}

triggers:
  - id: schedule
    type: io.kestra.plugin.core.trigger.Schedule
    cron: 0 8 1 * *
    description: at 8:00 AM on the 1st day of every month

Environment

• Kestra Version: latest 0.20.6

[Harsh4902]

@anna-geller can I work on this?

[MilosPaunovic]

Sure, go ahead @Harsh4902! 🚀

[anna-geller]

internal note: the bug is still there on develop built this morning

[anna-geller]

hey @Harsh4902 - this issue requires knowledge of how the scheduler works under the hood. I'd recommend picking some alternative issue labeled as good-first-issue as this one is quite difficult.