Your description is too general, and I do not know where the problem lies. After trying to reproduce the scenario in your code as follows, I did not encounter any errors:
    public partial class ThisDocument
    {
        private void ThisDocument_Startup(object sender, System.EventArgs e)
        {
            this.Application.ActiveDocument.Range().InsertAfter("...")
            AddComment(10, 20, "南無阿彌陀佛");
            AddComment(10, 20, "阿彌陀佛"); 

 
    
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