The extension adds an actual node to the tiptap content. Add a blank node after the node to solve the problem of not being able to append content.
npm install tiptap-extension-trailing-node -S
import TrailingNode from "tiptap-extension-trailing-node";
const editor = new Editor({
element: document.querySelector(".editor"),
extensions: [StarterKit, TrailingNode],
});
tiptap-Trailing Node: https://tiptap.dev/docs/editor/experiments/trailing-node
tiptap-appmsg-editor: https://github.com/KID-1912/tiptap-appmsg-editor