Dear Maintainer, The https://github.com/trapexit/mergerfs/pull/878 patch released as a part of mergerfs-2.32.3 upstream could be applied to the 2.31.0-1 version currently packaged in Debian bullseye to resolve the $subj issue. See https://github.com/trapexit/mergerfs/issues/877 and https://midnight-commander.org/ticket/4226 for additional background information. Alternatively, please consider packaging the latest upstream release. It contains several other fixes not related to this bug.
Hello Dmitry, Thank you for the bug report. Thanks. I'll try to aim for this soon. I'm not sure if that's feasible at this point in time, given the freeze for Debian Bullseye.
Problem still exists. Bullseye has been released, please fix now. Thanks