Assumptions:

• Question bank has at least two categories with more than 20 questions each
• Moodle 4.3.6 or 4.4 (on the current sandbox site)

Steps to reproduce:

• (optional) Use the attached question bank backup with 2 categories with 40 questions each: Question Bank Test Questions-20240813-0819.xml
• See attached video (taken from the current sandbox.moodledemo.net after importing questions) Add Question from Question Bank Paging Bug.mp4
• Create a new quiz
• select "questions"
• Use browser dev tools to inspect the page and the network traffic, paying particular attention to the Fetch/XHR traffic for the AJAX calls
• Click on "Add" -> "from question bank"
• (a pop up window with title "Add from the question bank at the end" dialog opens)
• Drop-down select a category with more than 20 questions (Test Questions Category 1 in the video example)
• Click on "Apply filters"
  • Notice in the network tab on the browser there is a single call to /lib/ajax/service.php?sesskey=xxxx&info=core_get_fragment
  • (the first page of the first 20 questions appears)
• Click on "2" to navigate to the second page
  • Notice in the network tab on the browser there are 2 calls to /lib/ajax/service.php?sesskey=xxxx&info=core_get_fragment
• Click on "1" to navigate back to the first page
  • Notice in the network tab on the browser there are 3 calls to /lib/ajax/service.php?sesskey=xxxx&info=core_get_fragment
  • In my video example, the category also switches back to the default category and no questions are in that category on the sandbox site.
• Change the category filter to another category with more than 20 questions (Test Questions Category 2 in the video example)
• Click on "Apply filters"
  • Notice in the network tab on the browser there is a single call to /lib/ajax/service.php?sesskey=xxxx&info=core_get_fragment
  • (the first page of the first 20 questions in the selected category appears)
• Click on "2" to navigate to the second page
  • Notice in the network tab on the browser there are 4 calls to /lib/ajax/service.php?sesskey=xxxx&info=core_get_fragment
  • Also a flash of the questions
• Click on "1" to navigate back to the first page
  • Notice in the network tab on the browser there are 5 calls to /lib/ajax/service.php?sesskey=xxxx&info=core_get_fragment
  • In my video example, the Test Questions Category 1 questions flash, then disappear as the category switches back to the default category

Observations:

• When inspecting the page and the "click" event listeners registered on the page numbers, every time a page number is clicked, there is a new "click" event registered to call first.js:2512 on every page link.  This seems to correspond to question/amd/src/filter.js line 183.  See attached screenshots of the registered event handlers.