Group Players: Songs stop prematurely with an error

I have begun to have (or just noticed I have) a problem with Group/Synchronized Players (Not Group Players solely as originally thought.) Some songs stop playing prematurely, seemingly exactly 10 seconds early, and display an error on the player screen:

Problem: Can't open file for: <name of song>

And the following error is logged in LMS:

[21-04-18 22:54:21.6627] Slim::Player::Squeezebox2::statHandler (149) Error: <MAC of a specific pCP/Squeezelite player>: Decoder does not support file format, code 0

I have confirmed that these files play normally using other music players, such as iTunes. I can play the SAME file on a single pCP rather than a group/synchronized player, and it completes normally with no error logged. Files are ALAC or AAC, for the most part.

The problem appears to remain persistent for a given file, in that I can re-add that song to my queue and the problem will recur while players are grouped/synchronized.

It's not every song, just some. I'm not sure when it began, but I have errors going back to 4/13.

I'm running the Group Players plugin v0.14.3

I'm running the official Docker version:

Logitech Media Server Version: 8.1.2 - 1618550311 @ Fri Apr 16 08:36:43 CEST 2021
Hostname: 2cc3948a001f
Server IP Address: 192.168.10.40
Server HTTP Port Number: 9000
Operating system: Debian (Docker) - EN - utf8
Platform Architecture: x86_64-linux
Perl Version: 5.24.1 - x86_64-linux-gnu-thread-multi
Audio::Scan: 1.02
IO::Socket::SSL: 2.044
Database Version: DBD::SQLite 1.58 (sqlite 3.22.0)
Total Players Recognized: 6