xfce4-screensaver unlocking fails

When trying to unlock the screen locker (xfce4-screensaver), it doesn't work, saying "Authentification failed".

I'm on postmarketOS edge (based on Alpine Linux edge) on virtual device qemu-amd64. I'm not yet sure if it is an issue in Alpine Linux or in postmarketOS.

In stable postmarketOS v23.12 (based on Alpine Linux v3.19), unlocking works. Something that confused me: When editing the repository to edge and upgrading all packages, it still works! It seems to make a difference between new installation and upgrading an existing installation.

As far as I can tell, the regression showed up somewhen between Dec 12th and Dec 22th (possibly rather towards Dec 22th).

logread | grep pam

[Dec 23 16:21:06] authpriv : pam_unix(lightdm-autologin:session): session opened for user user(uid=10000) by (uid=0) 
[Dec 23 16:21:06] authpriv : gkr-pam: gnome-keyring-daemon started properly

logread -l returns following:

locking (with lock button in whisker menu):

• no output

waking screen up:

[Dec 23 16:23:25] authpriv unix_chkpwd[2814]: check pass; user unknown

entering and hitting enter:

[Dec 23 16:23:43] authpriv unix_chkpwd[2885]: check pass; user unknown 
[Dec 23 16:23:43] authpriv unix_chkpwd[2885]: password check failed for user (user) 
[Dec 23 16:23:43] authpriv : pam_unix(xfce4-screensaver:auth): authentication failure; logname=user uid=10000 euid=10000 tty=:0.0 ruser= rhost=  user=user 
[Dec 23 16:23:43] authpriv : gkr-pam: stashed password to try later in open session 
[Dec 23 16:23:43] authpriv : gkr-pam: stashed password to try later in open session 
[Dec 23 16:23:45] authpriv unix_chkpwd[2887]: check pass; user unknown

after a minute of inactivity the screen blanks:

[Dec 23 16:24:47] authpriv : pam_unix(xfce4-screensaver:auth): conversation failed 
[Dec 23 16:24:47] authpriv : pam_unix(xfce4-screensaver:auth): auth could not identify password for [user] 
[Dec 23 16:24:47] authpriv : gkr-pam: no password is available for user 
[Dec 23 16:24:47] authpriv : gkr-pam: no password is available for user

Note: I have not installed package xfce-polkit but installing it doen't seem to make a difference on this specific issue.

Package versions:

• xfce4-session-4.18.3-r0
• xfce4-screensaver-4.18.2-r0
• linux-pam-1.5.3-r7
• gnome-keyring-42.1-r2
• elogind-252.9-r4
• polkit-elogind-123-r0
• polkit-common-123-r0
• libsecret-0.21.2-r0
• sudo-1.9.15_p4-r0
• postmarketos-base-32-r0
• postmarketos-base-ui-16-r1