Inconsistent result returned by zsh completion script when quarantine variables are defined

[xdelaruelle]

When some environment variables are defined for Modules quarantine mechanism:

$ module config run_quarantine 
Modules Release 4.5.1 (2020-06-01)

- Config. name ---------.- Value (set by if default overridden) ---------------
run_quarantine            LD_LIBRARY_PATH LD_PRELOAD (env-var)

Completion script on Zsh shell returns inconsistent results:

$ zsh
% autoload compinit
% compinit
% module -V
Modules Release 4.5.1 (2020-06-01)
% module avail<tab>
be                    load
\(cannot              module-git
cannot                module-info
dot                   modules
dynamically           mpi/
ERROR:                null
executable\):         object
from                  position-independent
ignored.              preloaded
LD_PRELOAD            use.own
ld.so:                \'/usr/bin/tclsh\'

It seems related to the evaluation of following line in _module_raw shell function:

$ /usr/share/Modules/libexec/modulecmd.tcl zsh autoinit
_module_raw() {
...
      eval `eval ${=_mlre}/usr/bin/tclsh /usr/share/Modules/libexec/modulecmd.tcl zsh '"$@"'`;
...

Quarantine variables set in _mlre variable are expanded to the /usr/bin/tclsh value rather being set empty.