After today’s update and reboot I got the following message
error: no such cryptodisk found.
Press any key to continue...
but reboot continued and worked.
I found a solution that worked for me in the Unstable thread at [Unstable Update] 2023-02-17 - Plasma 5.27 LTS, GNOME, Python - #50 by Skunkie (THX @Skunkie)