iOS 16 (and higher) offers automatic connecting with WIDI devices.
After confirming the connection for the first time between your iOS device and WIDI device, it will automatically reconnect every time you start your WIDI device or Bluetooth on your iOS device.
This is a great feature, as from now on, you will no longer have to manually connect each time. That said, it can bring confusion for those who use WIDI App to only update their WIDI device and not use an iOS device for Bluetooth MIDI.
The new auto-connection can lead to unwanted connecting with your iOS device.
To avoid this, you can create fixed connections between your WIDI devices via WIDI Groups.
Another option is to terminate Bluetooth on your iOS device when working with WIDI devices or to remove all WIDI devices from your general Bluetooth listing after updating.