Thanks, You are cloning. Then the main statement of the bug report is on the spot. Cloning with dd is risky, but when you do it the correct way it is a robust method and provides the same result as any other cloning method, for example with the Ubuntu Startup Disk Creator.
Please check when running live, if a casper-rw partition is created and if it is mounted as described in the bug report. And which is the big problem, if it is busy, so that it cannot be unmounted. I think you will find that it is the case, and I think confirming the bug helps getting the developers started.
It matches my findings. lsblk shows /var/crash is the mountpoint.
If you run also df -h you will see that it shows /var/log is the mountpoint.
My result shows that it is possible to unmount /var/crash but not /var/log. This means that the live system, when booted with the boot option toram cannot unmount all partiitions and run without the boot drive connected. What is worse, we have lost the ability to boot live-only and repair the casper-rw partition. Now another linux system is necessary for that task, and it makes things more complicated for beginners.