KVM Hosts Deleted off filesystem when VM host/rack connects to a different MAAS

A MAAS user deployed an 18.04 libvirt KVM host with MAAS 2.6.2. They then installed a MAAS 2.6.2 rack controller on the KVM host they just deployed. They setup a parallel MAAS 2.9.2 environment by cloning the database the MAAS 2.6.2 used. They turned off DHCP on one VLAN in the MAAS 2.6.2 environment so they could enable it in the MAAS 2.9.2 environment. They then connected the rack controller, running MAAS 2.6.2 to the MAAS 2.9.2 environment. This resulted in both VMs on the libvirt KVM host being deleted. The VMs remained modeled in both MAASes.

Attempting to connect one rack controller to two different MASSs is not possible. Connecting a MAAS 2.6.2 rack to a MAAS 2.9.2 region is incorrect and should be prevented(LP:1916089). MAAS should never delete a VM unless explicitly told to by the user.