I believe there is an issue in getpath expression in ut_xunit_reporter.
It uses a substring which can result in negative positive.
E.g. Package is named "ut_gen_pk_id_api" and annotation for suitepath is alltests

CREATE OR REPLACE PACKAGE ut_test.ut_generate_pk_id_api IS

--%suitepath(alltests)
--%suite(generate_primary_key)
--%displayname(Generate PK Function Suite)

--%test(ut_generate_pk_id)
--%displayname(Generate PK Function Test)
PROCEDURE ut_generate_pk_id;

END ut_generate_pk_id_apii;
/

When running that it reports a classname in xunit as : 'alltest' rather than 'alltests.ut_gen_pk_id_api'

Would not be better to replace

return substr(a_path_with_name, 1, instr(a_path_with_name, '.' || a_name) - 1);
with
substr(a_path_with_name, 1, regexp_instr(a_path_with_name, '.' || a_name||'$') - 1)