Unable to change existing schedules

I'm using g9542f7 here on Firefox/Linux and have created 2 schedules via templates for a team with one roster.

While my account is marked as "god" in the user table (which IMHO makes me admin), I can not change a schedule (in the future) created by the "Populate Schedule".

What I found out is that the tool already checks if a user is available for the given schedule (very nice) if I want to swap shift, so a user on vacation can not be chosen.

But what I expect is that I could - for example - change the hour or even day of the existing schedule, or even delete this schedule completely. This does not work for me. The popup window with the details open and I see the "Delete", "Save" and "Cancel" buttons - but everything I do/click in this window does not work. The buttons have no effect.

No files, tests, or entry points are named. Reproduce the issue with g9542f7 in Firefox on Linux by opening a future schedule created through Populate Schedule, then inspect the schedule details popup. Done means the Save and Delete actions work for an existing schedule.

Written by the indexing model from the issue text.