I’m using Pimatic on my iPhone via a WebApp shortcut (‘add to homescreen’).
I added successfully Tradfri/Aqara motion sensors and Tradfri Power Plugs via the Raspbee plugin. No IOS issues.
I removed the Pimatic WebApp and cleared the cache on my iPhone. Added now the Tradfri CT Lamp and accessed Pimatic via Sarafi browser. That worked, no errors!
I reinstalled the Pimatic WebApp again (‘Add to Home Screen’ ) and the errors where back.
So it seems that around te WebApp something happens.