When you select a channel on the config page (eg. the stereo input on a CQ-18T) and you switch to the processing or fader page then bank 3 is displayed automatically because this is where that input would be.
But using the custom layer this automatic switching still happens. If there are no faders on bank 3 in the custom layer and you select the stereo input you will be sent to an empty bank when going to the processing or fader page.
This feature is great if you don’t have the custom layer active, but annoying if you use the custom layer.
Not a big deal but it would be nice to be sent to the right bank if that fader is present on the custom layer or to be sent back to the bank you where previously on when using the custom layer.