Context menu not available when text is marked

[peterkraume]

According to the screenshot in the README, it is possible to mark text and then see some kind of context menu bubble right above the text:
https://github.com/in2code-de/typo3-tiptap/blob/main/docs/images/example-1.webp

This does not work with my current minimal configuration:

editor:
  tiptap:
    config:
      enableContentDragAndDrop: true

      plugins:
        - path: "@typo3-tiptap/tiptap/plugins/history.js"
          config: { types: [ "undo", "redo" ] }
        - path: "@typo3-tiptap/tiptap/plugins/bold.js"
        - path: "@typo3-tiptap/tiptap/plugins/italic.js"
        - path: "@typo3-tiptap/tiptap/plugins/link.js"
        - path: "@typo3-tiptap/tiptap/plugins/list.js"
          config:
            types: [ "ordered", "bullet" ]
        - path: "@typo3-tiptap/tiptap/plugins/source.js"