authentication bug (or feature?) with multiple encrypted lvm2 volume groups

[Marco Möller <talby@debianlists.mobilxpress.net>]

Two volume groups (lvm2) exists, Each of them is encrypted and thus 
protected by its own password. Lets call the volume groups and their 
corresponding passwords like this:

VG    password
"A"   "pwA"
"B"   "pwB"

"pwA" and "pwB" differ from each other.

Step 1: during boot I am asked for the password of "A"
Step 2: by accident I enter "pwB"
Step 3: consequently an error message is shown and "A" is not opened
Step 4: I am asked again for the password of "A"
Step 5: I now enter correctly "pwA"
Step 6: "A" is opened
Step 7: "B" is immediately opened without asking for its password

I confirmed, that the opening of "B" does only take place, when having 
entered in Step 2 the "pwB". If I enter in Step 2 something else, then 
in Step 7 it is asked for the password of "B", I would enter it in a 
Step 8 correctly and consequently in a Step 9 the "B" would be opened.

Obviously, the in Step 2 entered (wrong) password (for "A") is stored 
and without further interactive consultation automatically used as the 
input for the password authentication of "B".
Is this a bug or a feature? If it is a bug, where to report it?

Thanks in advance for your kind advice, Marco.


PS:  This is how in the past, more than a year ago, I created this two 
encrypted volume groups according to my installation notes:
When installing a new Debian/testing (bullseye) OS, then I "Create new 
empty partition table”, then created also these two volume groups by 
"use as: physical volume for encryption" followed by "Create encrypted 
volumes".