I have recently upgraded JSM from 9.0.0 to 9.10.1, following the upgrade I noticed the calendar field selection now has a confirm button.

But now when in the view/edit screen of an issue, when editing the date fields the calendar selection doesn't work.
1. Selecting the calendar:

2. Changing the date to the 15th and pressing confirm
3. The Start date field does not change

Is this a known bug? Is there a fix for this?
(It doesn't work for our custom fields or the system field 'Due date')