I have a modal with a button whose class sets up an onclick listener.
Before the modal is open, I see that the listener is enabled (via the Chrome inspector).
When I open the modal, the button does not work, and I see that the listener is gone from it.

It's a simple modal opened by a button.

Another example of the problem is if the modal has a Joomla calendar field. The Calendar icon does nothing.

I fixed the duplicate IDs (reusing the same Joomla form definition incorrectly), and I still have the problem.

I have distilled this down to a very simple case. Use the link below (on the same site), and you will see two buttons. One has a listener and displays an alert when clicked, and the other opens a modal. The modal has a button with a listener to display an alert when clicked.

As before, clicking the button in the modal does nothing. What I see in the Inspector is that the attached listener for the button disappears when the modal is opened.

There is a template problem generating duplicate IDs for login forms, but I'm guessing that has no impact here.

Also, I installed the Dec 31 update.

Works great, thanks.