Some audio tracks not exporting

Like some in here, I had trouble with music. This was good, 48K 16Bit audio that I could hear when editing but not when exporting. Simple timeline setup as far as I could determine. THE SOLUTION, FOR ME: Create a new track with the same settings as the track with the music, move the music to the new track. Works! No idea why, but it exports now.

In case anyone else is still having this problem, here's what obviously went wrong in my audio mixer, that was preventing the audio track included in the render: My automation mode setting for the missing track was set to OFF. The track came back when I changed it back to READ. Perhaps very basic stuff, but I didnt't know and ended up spending an hour trying to figure out what the problem was. Hope this helps someone.

Had trouble with audio track recorded using Windows Sound Recorder (11.2205.15.0) not getting rendered properly (either not rendered at all or partial render of audio clip).  Other elements of the video, including audio sourced from iPhone 12 @11765448, rendered out to 2K would render fine.  This problem does not always happen, but when it does for a particular video, it is repeatable.  I haven't isolated what elements of the job creates this problem, but I create a number of videos using the same workflow and formats with no problems with most of these jobs.

Tried restarting Premiere Pro & Media Encoder.  Tried deleting all Cache files.  Tried moving problem audio clip around a bit.  Problem persisted. 

Finally, right-clicked problem audio clip and did a Render and Replace.  The problem audio clip then rendered as part of the video as wanted.

Details:

(Premiere Pro Build 62, Windows 11, Intel 12900, 64MB RAM, 2TB SSD, NVIDIA 3080)

iPhone Video source 4K video/Source Audio Format: 44100 Hz - Compressed - Stereo.  Audio processed by Premiere Pro Essential Sound to increase amplitude 4dB.

Windows Sound Recorder: 48000 Hz - Compressed - Stereo, Processed with Premiere Pro's Essential  Sound to equalize and increase amplitude by 6dB.

I don't know what the source of the problem is, but it would be nice if Adobe were to fix it and then let us know in the Update notes.  In the meantime, I've got to modify my workflow to include the Render and Replace step before exporting to Media Encoder.

It's never easy to troubleshoot these problems from a distance, so please read this post carefully and answer the question in a systematic fashion.  And from your post, it's impossible to know your level of expertise.  Do not get offended if this stuff is obvious to you.  If I don't ask these questions, sometimes we miss the obvious...

tell us your source properties and sequence settings?    Here's the thing, there are some things that cause intermittent issues and although the previous versions had no problems, the problematic formats will sometimes rear their ugly little heads.

Tell us where your sources come from.  Any chance there are screen recordings or clips recorded on a smart phone?  

And although you can throw ALMOST any format at premiere, sometimes it's better to avoid these issues.    Generally, audio for video should be 48k 16 bit... uncompressesd and the sequence settings should match that.  If you have sources that are heavily compressed like mp3's transcode them to 48k 16 bit.    good luck.