"Failed to start LVM2 PV scan on device" at boot

English Install/Boot/Login
#1

The system is working fine with one PV over 2 drives. But I’m getting this error at boot that scares me now:

~: sudo journalctl -b -p err
PCSU systemd[1]: Failed to start LVM2 PV scan on device 234:0.

and at boot it asks me to do the following for detail:

~:systemctl status lvm2-pvscan@234:0.service
● lvm2-pvscan@234:0.service - LVM2 PV scan on device 234:0
   Loaded: loaded (/usr/lib/systemd/system/lvm2-pvscan@.service; static; vendor preset: disabled)
   Active: failed (Result: exit-code) since **** ago
     Docs: man:pvscan(8)
 Main PID: 1238 (code=exited, status=5)
#2

What is device 234:0? Output of “ls -l /dev/block” would be a start.

#3

Actually it’s 254:0. The command returns

lrwxrwxrwx 1 root root  7 Dec  5 06:56 254:0 -> ../dm-0

With some research I did:

~:dmsetup info /dev/dm-0
Name:              cr-auto-1
State:             ACTIVE
Read Ahead:        1024
Tables present:    LIVE
Open count:        3
Event number:      0
Major, minor:      254, 0
Number of targets: 1
UUID: CRYPT-LUKS1-a***4-cr-auto-1

I find it’s actually just my encrypted physical luks partition device, which consists of root and home lvm logical partitions. If this device fails, the machine would not have worked at all.
I recently added a luks password to it and meant to remove the first password as a change. I haven’t got the time to remove the first one. Can it be the cause? I tend to do these things slowly in afraid of breaking the whole system.