The problem

I have two tablets running fully kiosk and showing a dedicated dashboard for them. I made a user for that dashboard as non-admin and set kiosk_mode to display NO sidebar etc. Since latest beta update (dont know if Labs related) the following error shows up for both tablets.

What version of Home Assistant Core has the issue?

core-2025.12.0b2

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

kiosk_mode / Fully Kiosk

Link to integration documentation on our website

No response

Diagnostics information

cant, throws 404 error

Example YAML snippet

Anything in the logs that might be useful for us?

Additional information

There have been more users that reported this issue on HA discord beta channel