Steps to reproduce:
Open host prototype on some template with existing host group prototypes.
There should be listed some host group prototypes which was added earlier.

Result:
See screenshot...

Query

SELECT gp.hostid,gp.name FROM group_prototype gp WHERE gp.hostid=82764 AND gp.name!='';

is not fetch result. i.e. current host group prototypes.

If you use this query it works for Oracle.

SELECT gp.hostid,gp.name FROM ZABBIX.group_prototype gp WHERE gp.hostid=82764 AND gp.name IS NOT NULL

MySQL and PostgreSQL works fine with original query.

Expected:
So host group prototypes should be loaded. properly