See XWIKI-24033
One of the reason why this happens is that the delta calculated at https://github.com/xwiki-contrib/wiki-editor-devtools/blob/39c99b7067215b311960efa498106710d42d3ecb/editor-tool-highlighting/editor-tool-highlighting-ui/src/main/resources/SyntaxHighlighting/EnableSyntaxHighlighting.xml#L331 uses the first menu in the DOM. In the case where we're using the second editor, this first menu is hidden, the value becomes 0 unexpectedly.