pg_restore - generated column - not populating

Hi all,

My database has tables with generated columns. I altered a table and added
a generated column as below:

alter table billing add primary_bill_to_id int   GENERATED ALWAYS as
((info->>'vp')::int) stored


Now, when I do the pg_dump and pg_restore, this column does not get
populated. It remains null

"Info" is the jsonb column in the table and  info->>'vp' has values in
multiple rows but still generated column "primary_bill_to_id" is null after
the restore

I am using postgres version 13

Can you tell me what am I missing?

Thank you for your help.
Santosh