All Fritzdect lights inactive after core_2023.11.3 update

Hello,
today’s core_2023.11.3 update went smoothly. However, after reconnecting all Fritzdect lights (Fritzdect 500 via Fritz!Box integration) are inactive (greyed out). All automations regarding the lights do not work anymore.
Reloading the integration did not work, lights are still grey.
Then I deleted the light entities and reloaded the integration again. Now they are completely gone and don’t come back.

Switching the lights via FritzBox (app and webinterface) works. Fritz!OS version is/was 7.57 for quite a while now.

Anyone have any idea what is happening?

Thanks,
Mario.

EDIT: I just noticed, there is a report here also: Fritz!Box SmartHome Lights are no longer working after update to Home Assistant Core 2023.12 · Issue #105210 · home-assistant/core · GitHub

Same with my ESPHOME atomations. Stopped comunicating.