Dear Maintainer,

When attempting to unlock the screen after it locks automatically or manually,
KDE displays the following message:

"The screen locker is broken and unlocking is not possible anymore.
In order to unlock it, switch to a virtual terminal (e.g. Ctrl+Alt+F2), log in
to your account and execute the command:
loginctl unlock-session 3"

This issue happens repeatedly, requiring manual intervention to regain access.

Steps to Reproduce

Log in to a KDE Plasma session.

Allow the system to lock automatically or manually trigger lock (Ctrl + Alt +
L).

Attempt to unlock.

Error message appears instead of the password prompt.

Expected Behavior

The lock screen should prompt for a password and unlock normally.

Actual Behavior

The lock screen fails.

KDE shows the message:

"The screen locker is broken and unlocking is not possible anymore..."

The only workaround is switching to a TTY, running loginctl unlock-session <n>,
and returning to the GUI.

Additional Details

Affected Package: kde-config-screenlocker

Current Version: 5.27.5-2

Newer Version Available: 6.3.5-1 (Debian Testing / Unstable)

Issue still occurs consistently on 5.27.5-2.

No custom lock screen settings or third-party themes have been applied.

Workarounds Tried

Unlocking manually via loginctl unlock-session works, but only temporarily.

Updating the system to the latest stable packages did not resolve the problem.

Did not test on the newer 6.3.5-1 build yet.

please confirm that this bug is already resolved in 6.3.5-1