Playback selection in Transcript window breaks after applying an Audio Channel Preset

Playback selection in Transcript window breaks after applying an Audio Channel Preset in the clip > modify

Premiere Pro Beta V. 26.1.1 (Build 14)

Selections and playback within the Transcipt window works fine until applying an audio channel preset in the clip > modify window.

Example:

clip >modify>audio channel setting default preset (transcript playback works fine)

clip >modify>audio channel setting 'Sony FX6' preset (transcript playback breaks)

Use case:

I record with Sony FX6, boom mic audio is on channel 3.  I transcribe the source clip using channel 3.  When scrubbing/reviewing the clip I only want to hear Channel 3 audio (good audio track).

Side note:  I'd also love it to only import Channel 3 audio into timeline when inserting clips into the timeline (from transcript window or source window).  Not sure if that exists already.  Currently, I have 8 channels of audio into the timeline and I typically only need the one channel.  I then have to delete unwanted audio tracks.