I've got installed with a master node and child node.

host.create returns a permissions error:
Sending:{"jsonrpc":"2.0","method":"host.create","params":{"host":"test01","ip":"172.16.1.20","port":10050,"useip":1,"groups":[

{"groupid":100100000000006}

],"templates":[

{"templateid":100100000010047}

]},"auth":"0aba21679b09e4347601fa237a56e7c0","id":1}'
Response Body:{"jsonrpc":"2.0","error":

{"code":-32500,"message":"Application error.","data":"[ CHost::create ] No permissions !"}

,"id":1}

In addition, template.create returns a permissions error:
Sending:{"auth":"0aba21679b09e4347601fa237a56e7c0","id":1,"method":"template.create","params":{"host":"tmplinux","groups":[

{"groupid":100100000000001}

]},"jsonrpc":"2.0"}'
Response Body:{"jsonrpc":"2.0","error":

{"code":-32500,"message":"Application error.","data":"[ CTemplate::create ] You do not have permission to perform this operation"}

,"id":1}

The user being used for this request has Zabbix Super Admin privs and has read/write access to the group in question.

This error occured only at the time of node composition, and this error did not occured with normal composition.

Is this a bug?
This is similar to ZBX-1852 and ZBX-1955 and ZBX-3320.