Versions:
Angular version: 18.2.0
quill-mention: "6.0.1"
ngx-quill: "26.0.5",
quill-delta": "5.1.0",

Reproducing the issue:
This issue can be reproduced on https://quill-mention.com/

Steps:

1. Load the domain https://quill-mention.com/
2. Click on the "Add Mention Programmatically" button

Actual Result:
Mention is not added

Expected Result:
Mention should be added

Workaround:
The "Add Mention Programmatically" button starts working once you enter "@" in the editor.