Thousands of warnings: "Unable to format audio channels using 'AudioChannels'"

Sonarr version (exact version): 3.0.0.348
Mono version (if Sonarr is not running on Windows): 4.6.2
OS: Ubuntu 18.04
Debug logs:
(Make sure debug logging is enabled in settings and post the full log to hastebin/pastebin/dropbox/google drive or something similar, do not post them directly here. Post in .txt not .doc, .rtf or some other formatted document)
Description of issue:
My logs have thousands of these warning messages:

Unable to format audio channels using 'AudioChannels', with a value of: '6'

or

Unable to format audio channels using 'AudioChannels', with a value of: '2'

Sonarr appears to work fine, but the thousands of error messages make it very difficult to look through logs when I do have problems. I see there was another post about this in 2018 but it got no responses and the thread was closed. Any ideas?

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