Hello Matthew, This may be best addressed to the upstream lxcfs project on github, as Debian's packaging is pretty simple and doesn't modify the behavior of lxcfs.
I don't utilize containers at the scale that you do, so I haven't been able to directly reproduce this. Have you tried the current release of lxcfs (5.0.2)? I do host an unofficial backport of lxcfs for bullseye in my personal repo [1] if you'd like to give it a try. Mathias [1] -- https://apt.calenhad.com/
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