[4.x]: Notification toaster appear with empty message with every admin panel login

What happened?

Description

I successfully migrated from Craft version 3 to 4. Now whenever I login to the admin panel, an error notification toaster appears with an empty message. I can use the admin panel normally, but this empty error notification appears consistently after every login.

Steps to reproduce

1. Try to login to admin panel
2. Observe empty error notification toast appearing after successful login

Expected behavior

No error notification should appear after a successful login.

Actual behavior

A red error notification toast appears after login with an error icon but no error message text. The notification is triggered but the message is empty.

Craft CMS version

4.15.2

PHP version

8.0.28

Operating system and version

Linux 5.4.0-204-generic

Database type and version

MySQL 8.0.26

Image driver and version

GD 8.0.28

Installed plugins and versions

Activity Logs 1.7.4
Entry Count 3.0.1
Feed Me 5.11.0
Redactor 3.1.0
Section + Product Type 2.0.3

Start by reproducing the successful Craft CMS 4.15.2 admin-panel login with the listed environment and installed plugins. The report names no source file or test, so trace the login flow and notification handling to identify why an empty error toast is emitted. Done means successful login no longer produces an empty error notification.