Found the answer here: https://lists.gnu.org/archive/html/emacs-orgmode/2011-01/msg00292.html

Sorry for writing before looking through the archives carefully.

Best wishes for everyone.

Vikas


On Sun, 20 Jun 2021 at 16:26, Vikas Rawal <vikasrawal@gmail.com> wrote:
Hello,

org-collector.el seems to fill "0" for properties that are inherited just as it does for properties that are not defined for a particular headline (for which also, 0 is poor choice; nil would have been better). This should not be the correct behaviour. Or is it intentional, and I am missing something?

Thanks and best wishes,

Vikas 

Org-mode version: 9.4.5 (9.4.5-29-gc43041-elpaplus)