How to handle "could not find function xml_is_well_formed" when restoring database in Version 17

[George Weaver]

Good afternoon,

I am testing upgrading from Version 13 to Version 17.  I am getting the 
following error when trying to restore a database in Version 17 (the 
database was backed up from Version 13 using the Version 17 pg_dump):

   pg_Restore: error: could not execute query: ERROR:  could not find
   function "xml_is_well_formed" in file "C:/Program
   Files/PostgreSQL/17/lib/pgxml.dll"
   Command was: CREATE FUNCTION public.xml_is_well_formed(text) RETURNS
   boolean
        LANGUAGE c IMMUTABLE STRICT
        AS '$libdir/pgxml', 'xml_is_well_formed';

The only reference I can find to xml_is_well_formed in the Release Notes 
(Version 15) is:

   Remove xml2 <https://www.postgresql.org/docs/15/xml2.html>'s
   |xml_is_well_formed()| function (Tom Lane)

   This function has been implemented in the core backend since
   Postgres 9.1

How do I address this in restoring the backup to 17?

Thanks,

George