[BUG] GIT_SSH_COMMAND is not being decomposed

I am encountering a problem on one of our NonStop platform variants where the GIT_SSH_COMMAND string is not being broken into constituent parts. This is causing SSH to not run properly. As background, SSH is not in a standard location and has non-standard required arguments. This also occurs with core.sshCommand. The situation is:

git config --global core.sshCommand '/G/system/zssh/sshossz5 -Q'

which correctly sets .gitconfig as:

[core]
        sshCommand = /G/system/zssh/sshossz5 -Q

When git is run with GIT_TRACE=true GIT_PACKET_TRACE=true git fetch

We get the partial trace: 14:19:56.027088 trace: built-in: git fetch 14:19:56.029895 trace: run_command: '/G/system/zssh/sshossz5 -Q' -G user@host

The same trace on our systems that actually do work results in: 14:19:56.029895 trace: run_command: '/G/system/zssh/sshossz5' '-Q' -G user@host

I need help resolving why this is happening (as in where to look and debug the situation).

Urgently, Randall

-- Brief whoami: NonStop developer since approximately 211288444200000000 UNIX developer since approximately 421664400 -- In my real life, I talk too much.