Schedule with microseconds in offset launches only once

[dsyurchenko96]

Expected Behavior

A schedule launches workflows as defined in ScheduleIntervalSpec when its offset contains microseconds.

Actual Behavior

A schedule launches only one workflow as defined in ScheduleIntervalSpec when its offset contains microseconds.

Steps to Reproduce the Problem

Define ScheduleIntervalSpec with an offset containing microseconds and send a schedule.
Python SDK:

temporal_client = await client.Client.connect(TEMPORAL_ADDRESS)
interval = timedelta(seconds=120)
offset = timedelta(seconds=63, microseconds=123)

schedule_spec = ScheduleSpec(
    intervals=[ScheduleIntervalSpec(every=interval, offset=offset)],
)
schedule = Schedule(
    action=ScheduleActionStartWorkflow("workflow name", None),
    spec=schedule_spec,
)

await temporal_client.create_schedule("bug-repro-schedule", schedule)

The first schedule has an offset with microseconds, and the workflow is only launched once (the upcoming runs should have already passed).
The second schedule doesn't have microseconds in its offset, and the workflow is launched according to the specified interval and offset.

Specifications

• Version: temporalio==1.18.2 (UI 2.25.0)
• Platform: Debian

[chaptersix]

@dsyurchenko96 What’s your overlap policy? Was the Scheduled Action complete when the next run should have fired?
https://docs.temporal.io/schedule#overlap-policy

[dsyurchenko96]

@chaptersix the schedule policy is not set explicitly, so it's the default (ScheduleOverlapPolicy.SKIP then). The first run had already finished by the time the second one should have fired - the one at 13:51:03 and later did not run.