Proxy workflow - Audio Channels
If I modify Audio Channels for a clip in Premiere, THEN create a proxy of that clip (thru the proper channels, by right-clicking and selecting "Create Proxies", the proxy will not automatically attach to the clip. I must manually attach it. This is a really silly bug.

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Ryan Fritzsche commented
Yeah, I realize it’s not supported but.... this kinda kneecaps the proxy workflow. I mean, this is a major defect. I sure hope it’s addressed soon.
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Trent Happel commented
Thank you for the feedback and apologies. Currently Modify > Audio Channels is not supported for Proxy workflow and can lead to odd behaviors.
https://helpx.adobe.com/premiere-pro/kb/ingest-proxy-workflow-premiere-pro-cc-2015.html
• Modify > Audio Channels and Interpret Footage are also not supported for Proxy Workflows.