The files
 * /usr/bin/mcp
 * /usr/share/man/man1/mcp.1.gz
are contained in the packages
 * mmv/2.5.1-1+b2 as present in forky|unstable
 * python3-mcp/1.28.1-1 as present in forky|unstable

These packages can be unpacked concurrently, because there is no
relevant Replaces or Conflicts relation.  Attempting to unpack these
packages concurrently may result in an unpack error, order-dependent
placement of files or overwriting of packaged files.

Kind regards

Helmut Grohne