Calendar events on timesheet in Redwood?

Summary:

Has anyone been able to use the automatic addition of public holidays to the timesheet in Redwood?

Content (please ensure you mask any confidential information):

We have followed the documentation in order to add public holidays to the timecard automatically.

After generating empty timecards, we can see that the public holidays are taken into account, however the timecards that contain a public holiday can't be edited by the employee (the timecard simply won't open), while other periods that don't contain a public holiday open just fine?

Except for switching off Redwood again, is there a solution to this (or maybe we're doing something wrong)?