I also confirm that LAMW apps crash on Android 12.
In Google Play I have a number of apps which were made using LAMW. When Android 12 was released, the crash statistics in Google Play shows that all my apps which were made using LAMW are crashing on Android 12. Unfortunately I do not have physical device running Android 12, so I am unable to find the reason of crash. In Android 12 emulator apps run fine, however apps crash on physical devices running Android 12.