function defined (or not), more worries on version 10->14 upgrade

The function in question is working but I'm having trouble getting at
it's current definition and the possibility that there are more v10->v14
issues in this database.  The last ERROR: below seems to me "a system
thing"(tm)

barnard=# \df genome_threshold_mono
                                                 List of functions
 Schema |         Name          | Result data type
|                  Argument data types                   | Type
--------+-----------------------+------------------+--------------------------------------------------------+------
 public | genome_threshold_mono | uuid             | pbs_name text,
genome_name text                        | func
 public | genome_threshold_mono | uuid             | pbs_name text,
genome_name text, conf double precision | func
(2 rows)

barnard=# \df genome_threshold_mono(pbs_name text, genome_name text,
conf double precision);
ERROR:  invalid regular expression: parentheses () not balanced

barnard=# set search_path = shoc,base,public, bulk;
SET
barnard=# begin;
BEGIN
barnard=# select genome_threshold_mono('asdf', 'qewq');
NOTICE:  group id is <NULL>
ERROR:  Could not find markerset for qewq
CONTEXT:  PL/pgSQL function threshold_process(uuid,text,boolean)
line 11 at RAISE
SQL statement "select threshold_process(tid, genome_name, false)"
PL/pgSQL function genome_threshold_mono(text,text,double precision)
line 22 at SQL statement
SQL statement "select genome_threshold_mono(pbs_name, genome_name,
1.96)"
PL/pgSQL function genome_threshold_mono(text,text) line 5 at SQL
statement
barnard=# rollback;
ROLLBACK
barnard=# \df genome_threshold_mono(pbs_name text, genome_name text,
conf double precision);
ERROR:  invalid regular expression: parentheses () not balanced

The supplied arguments to the function in question are obviously bogus,
but the reaction is correct, including call to nested functions.