Replication Task: divide by zero

I created an encrypted dataset
Created a periodic snapshot task
Started a robocopy of ~30tb of data.
Enabled replication. It took several attempts to enable replication as the encryption caused a few errors.

I'm not sure what extra detail will help.

replication.run
0.00%
Status: FAILED
Start Time: 2020-10-20 05:22:14
Finished Time: 2020-10-20 05:22:24
Error: division by zero

[2020/10/20 05:22:14] INFO [Thread-100] [zettarepl.paramiko.replication_task__task_1] Connected (version 2.0, client OpenSSH_8.2-hpn14v15)
[2020/10/20 05:22:14] INFO [Thread-100] [zettarepl.paramiko.replication_task__task_1] Authentication (publickey) successful!
[2020/10/20 05:22:14] INFO [replication_task__task_1] [zettarepl.replication.run] For replication task 'task_1': doing push from 'ken-backup/sql-smb' to 'mke-pool/sql-smb' of snapshot='auto-2020-10-19_23-30' incremental_base='auto-2020-10-19_23-00' receive_resume_token=None

root@ken-zyw-nas02[~]# pgrep -lf sending
22068 zfs: sending ken-backup/sql-smb@auto-2020-10-20_00-30 (100%: 230049237924/0)

replication.run
20.00%
Status: FAILED
Start Time: 2020-10-19 23:01:49
Finished Time: 2020-10-19 23:02:02
Error: division by zero

Status: FAILED
Start Time: 2020-10-19 23:00:24
Finished Time: 2020-10-19 23:00:25
Error: [EFAULT] Destination dataset 'mke-pool/sql-smb' already exists and is it's own encryption root. This configuration is not supported yet. If you want to replicate into an encrypted dataset, please, encrypt it's parent dataset.

Status: FAILED
Start Time: 2020-10-19 22:42:36
Finished Time: 2020-10-19 22:42:39
Error: [EFAULT] Unable to send encrypted dataset 'ken-backup/sql-smb' to existing unencrypted or unrelated dataset 'mke-pool'.