Exporting file with multichannel audio (6 mono channels) turns into "5.1 mapp" in metadata

Hello,

I'm having a problem with the audio metadata of exported files.

Exporting files with multichannel audio (6 mono channels) turns into "5.1 mapp" in metadata.

This causes it to fail the television station's QC process.

These are the 6 monos:
OV L
OV R
M&E L
M&E R
DIAL L
DIAL R

I found it strange when they complained and then I imported that file into premiere and in fact, inside premiere, the metadata it appears "5.1 mapp" instead of multichannel.
And I can't get the metadata to be exported correctly.

SEQUENCE AUDIO TRACKS:

EXPORT SETTINGS:

METADATA OF SEQUENCE VS METADATA OF IMPORTED FILE 

I hope someone can help me. I would be very grateful. 🙂

Thank you very much,

Tiago