I grepped a bunch and at least the following projects still use the removed
icons:
mediawiki/extensions/BlueSpiceBlog
Uses 'newspaper' icon in resources/ve/ve.ui.BlogInspectorTool.js. It needs
a dependency on 'oojs-ui.styles.icons-editing-citation' to continue
displaying the icon. (Filed T202336.)
mediawiki/extensions/ProofreadPage
Uses 'clip' icon in modules/ve/node/ve.ui.MWPagequalityInspectorTool.js.
(Filed T202337.)
mediawiki/extensions/VisualEditor
Uses 'settings' icon in modules/ve-mw/ui/pages/ve.ui.MWSettingsPage.js.
(Apparently this has already been spotted by our excellent QA engineers and
reported in T202101. Thank you!)
oojs/ui
Heh, we still use the 'settings' icon in demos and documentation. Oops…
(Filed T202338.)
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Matma Rex