Schedules no longer working

[rmnvncnt]

Bug summary

Since I upgraded Prefect from v2 to v3, schedules on existing deployments seems not to work anymore. I can create or activate a new schedule, either from the UI or from my prefect.yaml file, but no upcoming flows will be scheduled.

In the following example, I created a new hourly schedule for this deployment, yet no upcoming runs are scheduled :

I plan on wiping my internal database and upgrade to Prefect 3.1 but is there something I can do before doing that?

Version info

Version:             3.0.1
API version:         0.8.4
Python version:      3.11.7
Git commit:          c6b2ffe1
Built:               Fri, Sep 6, 2024 10:05 AM
OS/Arch:             darwin/arm64
Server type:         server
Pydantic version:    2.9.1
Integrations:
  prefect-slack:     0.3.0
  prefect-aws:       0.5.0
  prefect-docker:    0.6.1
  prefect-dask:      0.3.1

Additional context

No response