Zabbix 5.0.20 LTS aggregates Host Export is not importable to Zabbix 6.0.0rc2

Steps to reproduce:

1. Create a host with a groupsum function e.g.
   grpsum["24-7/CSV/123456/ServerA-ServerB","Numeric,DiskStatus,20b83d8280df404c9e1351db5ab7e26e]","last","0"]
2. Export Host from 5.0.20 LTS
3. Import Host into 6.0.0rc2

Result:
**

Import

Details Import failed

• Updated status of host "24-7 CSV Aggregates Host".
• Invalid parameter "/1/params": invalid second parameter in function "last_foreach".
  Expected:
  Should import the Host with its 100+ aggregates to the new aggregate format, but it fails.