modules/luksbootkeyfile/main.py in Calamares versions 3.1 through 3.2.10 has a race condition between the time when the LUKS encryption keyfile is created and when secure permissions are set.
{ "binaries": [ { "binary_version": "3.1.12-1", "binary_name": "calamares" } ] }
{ "binaries": [ { "binary_version": "3.2.20-0ubuntu1", "binary_name": "calamares" } ] }
{ "binaries": [ { "binary_version": "3.2.61-0ubuntu0.1", "binary_name": "calamares" } ] }