Highlight annotation is not getting deleted from Comment list

Hello,

When I delete annotation using PDPageRemoveAnnot method, it deletes the annotation from the page successfully.

But when I look at the comment tab, it still remains there.

Here is my code snipet to find and delete required highlight annotation:

for (int i2 = 0; i2 < PDPageGetNumAnnots(page); i2++) {
  //Get a specific annotation
  annot = PDPageGetAnnot(page, i2);
  if (PDAnnotIsValid(annot)){
  //Determine if the annotation is a Highlight annotation
  if (PDAnnotGetSubtype(annot) == ASAtomFromString("Highlight")) {
  //Create a character pointer to store the annotation's text
  char * annBuf;
  ASInt32 bufSize = PDTextAnnotGetContents(annot, NULL, 0) + 1;
  //Allocate the size of bufSize to the character pointer
  annBuf = (char*)ASmalloc((os_size_t)bufSize);
  //Populate annBuf with the annotation's text
  PDTextAnnotGetContents(annot, annBuf, bufSize);
  //Compare the contents of annBuf with a string
  if (strcmp(annBuf, ident) == 0){
  annotPageNum = i;
  ASFixedRect frect;
  PDAnnotGetRect(annot, &frect);
  PDPageRemoveAnnot(page, PDPageGetAnnotIndex(page, annot));
  break;
  }
  }
  }
}

Can you please help what am missing here?

Thank you in advance!