Fix environment variable order for global rank determination

[konstantinjdobler]

This resolves the issue #11380 and the underlying root bug described here #11380 (comment).

Fixes #11380

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[tchaton]

LGTM !

[Borda]

mind add chlog entry?

[awaelchli]

Thanks for the patience @konstantinjdobler
This change will be included in the next release, 1.6