How to make the USB connection default to file transfer on Android 14 (and newer)?

In the past, I could choose the default USB connection function on Android using Developer Options. Settings->Additional Settings->Developer Options->Default USB Configuration->File Transfer/Android Auto and Settings->Additional Settings->Developer Options->Select USB Configuration->MTP However, this does not work with Oppo OnePlus Ace 2 Pro. Each time I connect a cable, a popup appears, and I have to tap on "File Transfer" manually. There are rumors that this (anti)"feature" is omnipresent on Android 14, but I am not sure about that. How do I disable such a behaviour? Assume root is available, and I am not afraid of breaking CTS/SafetyNet, and rebuilding the kernel.