Continuing the discussion from Discourse Checklist:
We’ve encountered this bug where the checklists don’t work if it’s preceded by a date range.
On our site:
This works
2024-04-17T16:00:00Z→2024-04-22T16:00:00Z
but this doesn’t
2024-04-17T16:00:00Z→2024-04-22T16:00:00Z
This works
Doesn’t replicate here, unfortunately.
Have you updated your site recently? If it’s not replicable here it may already be fixed. 
This one, I think:
Update 2024-04-20T03:05:00Z Upgraded my Discourse installation last night and can confirm that the issue is fixed 
Thanks @JammyDodger!
Oh, so it was a recent fix. Will update later tonight and get back to you. Thank you!