After the phone is disconnected from the B4A bridge and wanted to run the app or want to try the APK file on a different phone. You received " waiting for ide debugger to connect" and that is the end, it wasn't so before version 10.2
Just sharing my experience resolving problem with B4i Bridge.
Follow instruction on this page: https://www.b4x.com/android/forum/threads/installing-b4i-bridge-and-debugging-first-app.45871/
B4i bridge installed successfully
Testing Hello World, success.