Cannot install using 2 nvme drives and 2 luks partitions

[oncethor]

Hello, I get an error when trying to install linux mint 20.3 (latest installer) on this configuration:

• 2 nvme drives
• one luks partition on the 1st drive to be mounted as "/"
• one ext4 partition on the 1st drive to be mounted ad "/boot"
• one fat32 partition on the 1st drive to be used ad "EFI"
• one luks partition on the 2nd drive to be mounted as "/home" The creation of the partitions (with luks) works well enough (but there are some minor bugs there as well), but whatever fs type I decide to use for "/" and "/home" (be it ext4 or btrfs) as soon as I get to the page where I can specify the time zone, after a few seconds I get the message that "The attempt to mount a filesystem with type ext4 (or btrfs) in Encrypted volume (...) at /home failed. You may resume...". Then if I go back the UI is a little bit out of sync...

I have tried many times: restarting, rebooting, reloading... it's always the same result: cannot install linux mint in that computer. There are already another 2 linux distributions on the 2 drives with the same configuration and they work well. Uploading a screenshot and the syslog.

syslog.gz

[oncethor]

I am willing to fix this myself - if possible - cause I need to install mint on that pc. But I need some hints on how to build the installer from the source code (and enable debugging?) Thanks!