I'm trying to start docker images as -shardsvr, but it returns the known error message "BadValue: Cannot start a shardsvr as a standalone server. Please use the option --replset to start the node as a replica set." despite using the option -replSet literally in the same command.

So for some weird reason the check fails to properly recognize an existing --replSet option.

This happens using the most recent docker images for MongoDB Community and Enterprise (5.0.5).

Starting them as a replica set alone (without --shardsvr) works fine without errors, and gives me a properly working replica set.