Seems that rendering of EUI-64 does not work correctly for virtual machines that don't have a MAC-address yet. Should be rendered as soon as the virtual machine has been created.

Reproducibility: 100%

Steps to recreate
- Create new virtual machine
- After creation, observe that the IPv6 is not set correctly

Workaround
- Create new virtual machine
- After creation, edit machine (before installation is completed)
- Change interface settings and re-add IPv6 subnet (with EUI-64 enabled)
- Save settings