Looks like "Segoe UI" fonts are available at https://docs.microsoft.com/en-us/windows/uwp/design/style/segoe-ui-symbol-font (via a link to https://aka.ms/SegoeFonts ), in case that font happens to be specially-able to trigger this bug (not sure).
Bug 1574392 Comment 9 Edit History
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Looks like "Segoe UI" fonts are available at https://docs.microsoft.com/en-us/windows/uwp/design/style/segoe-ui-symbol-font (via a link to https://aka.ms/SegoeFonts ), in case that font happens to be specially-able to trigger this bug (not sure). [EDIT: These fonts didn't help me trigger the bug on Linux, but I did trigger the bug on Win10 without having to install any fonts -- see comment 11]