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Git diff --name-status master branchB works but fails on master branchC

The scenario is this:
Create a master branch - make updates - add/commit
New branch to branchB - make changes/updates - add/commit
New branch to branch C (from branchB) - make changes/updates - add/commit

issue git diff --name-status master branchB and all is good
issue git diff --name-status branchB branchC and all is good
issue git diff --name-status master branchC and get invalid results (

When I do this on my windows 10 pc everything works and no invalid results.

Using Rocket Port of git at git version 2.14.4_zos_b09
and Windows version at git version 2.17.1

Is this a known issue?