I suspect the latest snapshot must have introduced a major issue that’s causing boot to freeze when some hard drives are listed in fstab. I explained the problem in detail here:
It started happening after a systemd update. However I run the kernel 5.x series, with both 5.11 and 5.12 doing it… the issue described above is said to be related to 4.19 alone. Could there be more to that problem than is known? Will wait for that patch to be reverted then try again in next stable.