The problem

Was notified - as normal - that 2028.8 was available, and upgraded. That evening I found I couldn't turn lights on via IKEA Somrig or Rodret switches. My first thought was hardware failure until I realised it was all the devices. All functionality returned to normal after restoring the backup to return to 2025.7.4.

What version of Home Assistant Core has the issue?

2028.8

What was the last working version of Home Assistant Core?

2025.7.4

What type of installation are you running?

Home Assistant Supervised

Integration causing the issue

Standard Zigbee.

Link to integration documentation on our website

No response

Diagnostics information

Example YAML snippet

Anything in the logs that might be useful for us?

Additional information

I'm running Supervised on an Intel NUC and Debian. Have a few months yet before it's EOL after December, but this feels merely like a bug in the update rather than something installation-specific. Let me know if you need me to re-apply the upgrade and test anything to help narrow down the issue.