Selection marker is gone after selecting a <br> node

[Rain-Zheng]

Describe the bug
The selection marker in content model is gone after calling selectNodeContents on a <br> node. If calling selectNode, the marker won't be lost.

To Reproduce
The sample code for reproducing:

const range = new Range();
const br = contentDiv.querySelector('br');
range.selectNodeContents(br);
range.collapse(true);
editor.setDOMSelection({
  type: 'range',
  range: range,
  isReverted: false,
});
console.log(editor.getContentModelCopy('disconnected'));

The exported content model doesn't contain any selection marker. You can try this in codepen: https://codepen.io/xy-z-the-animator/pen/oNKgZeK

Expected behavior
The editor should handle the selection inside <br> element and include selection marker in the exported model.

Device Information

• OS: Any
• Browser: Chrome
• Version: 128