I would give their issue tracker a check. I searched "4.3.2 crash" and found several results that sound related to your issue. You can use the following link to get to the issue tracker query right away:
I would recommend running the LTS version which stands for Long Term Support unless there's something really needed in 4.3 for a project. If that's the case, then try an experimental release to see if your issue has been resolved. The following link will take you to the LTS releases:
I think I understood where's the problem was. I switched from virtio to QXL in the video section of my virt-manager, and everything started working successfully! π
I'm just throwing random stuff out but are you passing your GPU to the VM? It could be that when you switch to Material Preview there's no GPU to process it fast enough and it crashes.