Thank you for the very fast responses.
In the meanwhile it was night over here, so it took me some time to comeback on it.
There are no BLE or bluetooth widgets in the app or in any other app of mine.
In iOS the BLE widget in the widget box is grayed out and mentions “installed” (but it is not in the app screen)
I also noticed that in the device screen, since the update, the combination of Arduino nano and Wifi is mentionned, where I built the app before the update with Arduino uno and bluetooth. So this changed by itself, with the update.
In Android the BLE widget in the widget box is also grayed out, but reads “no BLE device” and again it is not in the app screen (same goes for Bluetooth, I have both to test on Android, but I was using BLE). My device has BLE and Bluetooth capabilities, it worked before the update.
Strangely enough in Android the device screen switched to Arduino nano and Ethernet.
Maybe these differences are a clue.
Adding devices with a combination Arduino + Bluetooth does not make it possible to add the BLE or Bluetooth Widget.