"Update catalogue item" consistently failing browser test

**Describe the bug or behavior**
The browser tests are consistently failing at test_browser.clj, line 2674
`(btu/wait-disabled {:tag :button :fn/text "Update catalogue item"})`

**To Reproduce**
HEADLESS=0 lein kaocha --focus rems.test-browser/test-update-catalogue-item

**Expected behavior**
The button should become disabled but it remains active, failing the check.

Start with test_browser.clj at line 2674 and run HEADLESS=0 lein kaocha --focus rems.test-browser/test-update-catalogue-item to reproduce the failure. Trace the browser test around the "Update catalogue item" button and determine why it remains active; done means the button becomes disabled and the focused test passes.

Written by the indexing model from the issue text.