Module with reflexive conflict fails to load by its full pathname

[xdelaruelle]

When a modulefile defines a reflexive conflict (to ensure only one version of the module is loaded):

$ module -V
Modules Release 4.5.1 (2020-06-01)
$ module use /path/to/modfiles
$ module avail
---------------- /path/to/modfiles -----------------
mod/1  
$ cat /path/to/modfiles/mod/1
#%Module
conflict mod

An error is obtained when this module is loaded by its full pathname:

$ module load /path/to/modfiles/mod/1
Loading /path/to/modfiles/mod/1
  ERROR: /path/to/modfiles/mod/1 cannot be loaded due to a conflict.
    HINT: Might try "module unload mod" first.

[xdelaruelle]

This issue was first reported on RH bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1860674