Comment # 5 on bug 1185307 from Mark���ta Machov���

From the upstream issue:

You need to activate option "[o] Add" under "Operations" as well to have the
comment being "added" instead of comment replacing all cell content in A2

From my perspective not a bug but usage error.

Ref.:
https://help.libreoffice.org/7.1/en-US/text/shared/01/02070000.html?System=UNIX&DbPAR=CALC&HID=modules/scalc/ui/pastespecial/dialog-action_area1#bm_id31541011

Really, with the "Add" option checked it works for me. So I am closing it.