Along with extended nested host group support, the syntax for including nested subgroups has changed.
In Zabbix 3.2.0 and 3.2.1 nested host groups are included with the parent host group, it the parent group is specified as
hostgroup/*. In Zabbix 3.2.2, the '/*' syntax is dropped. Instead, nested host groups are included if simply the parent host group is specified as is. This means that a host group that is set, for example, in action conditions, now silently includes all its nested host groups.