Icons Vanish From Dropdown Menus After SVG Migration Despite Valid Sprite Files

After migrating from CSS sprites to SVG icons, some dropdown menus lost their icons even though toolbar icons still rendered correctly. The article explains that the problem stems from an incomplete migration, where the toolbar used the new SVG symbols while dropdown components still referenced legacy CSS sprite markup. It cites an August 2026 report in Euro-Office DocumentServer, in which menu items that depended on removed PNG sprite assets displayed blank spaces. The author notes that such failures often evade functional tests, since menus still open and actions still run, with only the icons missing. A small React and TypeScript demonstration is used to reproduce the issue and show how to correct the rendering code.
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