Collapse’s `aria-expanded` attribute never leaves `true` state.

Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

When a Collapse trigger is clicked, it should update the trigger’s aria-expanded attribute from "true" to "false" and vice versa. The test case shows that only the change from "false" to "true" happens. The attribute never gets updated again when the trigger is clicked again.

Note that the change from "false" to "true" doesn’t happen either if the div.collapse is removed. This might be by design, but I think this is a bug, too. There might be nothing to display at the time the trigger is clicked, but IMHO, the element still got expanded and should reflect that.

The reason I care about this is because I show an icon to display if a collapsible element is currently collapsed. Similar to the demo, I update the icon in CSS based on the trigger’s aria-expanded attribute.

Reduced test cases

https://stackblitz.com/edit/stackblitz-starters-zhsmta?file=index.html

What operating system(s) are you seeing the problem on?

Linux

What browser(s) are you seeing the problem on?

Chrome, Firefox

What version of Bootstrap are you using?

5.3.3

Start with the reduced StackBlitz test case and trace the Bootstrap 5.3.3 Collapse trigger behavior in both Chrome and Firefox. Verify that repeated clicks toggle aria-expanded between true and false, including when the target div.collapse has been removed; the issue is done when the attribute consistently reflects the trigger state.