"Echo Midi Input" using inconsistent channels

Hi all,
It seems there is a inconsistency in how "Echo Midi input" work in Notion.
If I select an external midi staff which is say, set to channel 2, although Notion did respect the setting and send the input from my keyboard through channel 2, but it seems that the cc message (e.g. expression) are still send through channel 1, or I am missing something?
Hope it make sense.
Thank you.
It seems there is a inconsistency in how "Echo Midi input" work in Notion.
If I select an external midi staff which is say, set to channel 2, although Notion did respect the setting and send the input from my keyboard through channel 2, but it seems that the cc message (e.g. expression) are still send through channel 1, or I am missing something?
Hope it make sense.
Thank you.