To reproduce this issue :

 - Clean Ubuntu 22.04

 - Jenkins 2.346.1

 - matrix-auth-3.1.4

 - With LDAP and matrix-auth-plugin

From /configureSecurity/ web page, when clicking on "Add user..." or "Add group..." a popup ask to enter the username, then after clicking on the "OK" button, nothing happen.

This is not possible to add a new user.

I was able to pin point the bug to the following line https://github.com/jenkinsci/matrix-auth-plugin/blob/matrix-auth-3.1.4/src/main/resources/hudson/security/table.js#L41

item.getAttribute("title") is null. The title is not set on the image, but on the parent element.