I can't offer any meaningful advice, I can only say that I too have been
unable to play low sample rate MP3s on a Pi running
Squeezelite/Max2Play.
I have so few of them and am not particularly attached to any of them,
so I have never put any real work into figuring out what's going on.
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My setup:
-Logitech Media Server Version: 7.9.2 - 1565967976 @ Fri Aug 16
17:16:14 CEST 2019
Player Model: Squeezebox Touch, Firmware: 7.8.0-r16754
Plugins: A few, but nothing unusual.
Applets: EDO, but same behavior without EDO
No custom-convert.conf file-
All my music is FLAC at various sampl