FocusCatcher input has no label

On the OfficeMacro page used in the test suite, there's an unlabelled field:

WCAG warnings in the test class [org.xwiki.export.pdf.test.ui.AllIT]:
__________

Validation in the test method [officeMacro]
Check for [org.xwiki.test.ui.po.ViewPage] at http://xwikiweb:8080/xwiki/bin/view/PDFExportIT/OfficeMacro.
Found [1] items

1: Form elements must have labels
Description: Ensure every form element has a label
Help URL: https://dequeuniversity.com/rules/axe/4.10/label?application=axeAPI
Help: Form elements must have labels
Impact: critical
Tags: cat.forms, wcag2a, wcag412, section508, section508.22.n, TTv5, TT5.c, EN-301-549, EN-9.4.1.2, ACT

HTML element: 
    <input type="text" tabindex="-1" class="focusCatcher">
Selector: [.focusCatcher]
Fix any of the following:
  Form element does not have an implicit (wrapped) <label>
  Form element does not have an explicit <label>
  aria-label attribute does not exist or is empty
  aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
  Element has no title attribute
  Element has no placeholder attribute
  Element's default semantics were not overridden with role="none" or role="presentation"

This is probably related to https://github.com/xwiki/xwiki-platform/blob/aa181b9c5d1417e04b6dce5cec1a3cfea025b250/xwiki-platform-core/xwiki-platform-web/xwiki-platform-web-war/src/main/webapp/resources/uicomponents/widgets/gallery/gallery.js#L27

Similar report in another test suite:

 

WCAG warnings in the test class [org.xwiki.officeimporter.test.ui.AllIT]:
__________
Validation in the test method [verifyImport]
Check for [org.xwiki.flamingo.skin.test.po.AttachmentsViewPage] at http://xwikiweb:8080/xwiki/bin/view/NestedOfficeImporterIT/verifyImport/.
Found [1] items

1: Form elements must have labels
Description: Ensure every form element has a label
Help URL: https://dequeuniversity.com/rules/axe/4.10/label?application=axeAPI
Help: Form elements must have labels
Impact: critical
Tags: cat.forms, wcag2a, wcag412, section508, section508.22.n, TTv5, TT5.c, EN-301-549, EN-9.4.1.2, ACT

HTML element: 
    <input type="text" tabindex="-1" class="focusCatcher">
Selector: [.focusCatcher]
Fix any of the following:
  Form element does not have an implicit (wrapped) <label>
  Form element does not have an explicit <label>
  aria-label attribute does not exist or is empty
  aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
  Element has no title attribute
  Element has no placeholder attribute
  Element's default semantics were not overridden with role="none" or role="presentation"