Comments from highlight not displayed in documents (Mac Sequoia)

I face a bug on pdfgear 2.10 on Mac : I am used to highlight in yellow a group of words, right click to 'add note' and put some comment (visible as a small yellow square near the highlighted words). When I save and reopen the pdf, the highlights are still visible, but not the notes (neither in the left margin in Annotations panel nor in the square that has vanished). However, the notes still exist since I can see them properly in other pdf readers. In addition when I right click on the highlighted words the delete note option is present, which suggests they are also hidden somewhere in pdfgear. Do you have an idea of how to solve this bug?