Thanks Jiannis, and yes I checked that along with the other breaking changes. My config is the newer style.
This is a post I did about the build: https://community.home-assistant.io/t/control-panel-esp32-based/840600
It does have a ILI9488 which I can see others have had problems with ILI9xxx devices but the logs don’t mention display issues.
My symptons are:
Blank / unresponsive screen
ESPHome reports device as offline
Home Assistant resport device is unavailable
Cannot access logs from ESPHome dashboard
Reverting to previous add-on version corrects the problem.
I will keep investigating 