Changing Bluetooth MIDI MTU on Android leads to no longer receiving sysex messages

I’m trying to change the Bluetooth MIDI MTU in our Android app. The change is very simple in

public void onConnectionStateChange (BluetoothGatt gatt, int status, int newState)
    if (newState == BluetoothProfile.STATE_CONNECTED)
        gatt.requestConnectionPriority (BluetoothGatt.CONNECTION_PRIORITY_HIGH);
        boolean ret = gatt.requestMtu(185); //<-- added this line
        owner.pairBluetoothDeviceStepTwo (gatt.getDevice ());

However, this results in a rather weird bug: our app can no longer receive sysex messages. It receives note on/offs, CCs, pitch wheel changes, etc, but no sysex.

I do not have this issue with a similarly modified version of the midisuite apps, so it would seem to indicate some issue in the JUCE layer…?

Ah, I just noticed that I’m getting the sysex messages in the JUCE MidiDemo. Probably a bug in our app then!