I updated the firmware of my Nordic Thingy 52 to the latest version 2.20 using the Android app on my smartphone.
Now I cannot use anymore the standard webapp (https://developer.nordicsemi.com/thingy/52/),
It pairs, but then it says that I am running an obsolete Firmware, and I did find no way of using the webapp anymore for capturing orientation data from the Thingy 52.
The Thingy instead works perfectly with the Android app.
So I suppose that the webapp source code must be upgraded for working with firmware 2.20.