Zoom Audio not picking up the Music instruments sound even after enabling the original sound

Zoom Audio not picking up the music intrumemts sound even after enabling the original sound for musiciation. I am having this issue for the last six months, hoping Zoom would iron this out. However, it has been working previously.

I have tried all the zoom settings. No luck.

I have also checked Mac, as to whether it is dropping the input. But, Mac is taking the instructions sound.

I have tried with a professional audio card, and it is confirmed Zoom is dropping the music instrument sound. 

Zoom Team: I would appreciate it if you could address this issue. 

Note: I am not a paid user currently, but my tuition provider has the paid version. 

Zoom version: version 6.4.0 (51205)

OS: Moc OS (Apple Zip) - 15.3.2 (24D81)