I have a MultiJob which triggers jobs for different architectures. I've enabled Pass-through Git Commit that was built and if a build with the same parameters gets scheduled again it passes the revision of the previous build to the downstream projects, instead of the one the MultiJob has checked out.
In that case also GIT_REVISION variable is evaluate to that wrong revision, but that doesn't harm me.

> /usr/bin/git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
> /usr/bin/git config remote.origin.url git://github.com/xbmc/xbmc.git # timeout=10
Pruning obsolete local branches
Fetching upstream changes from git://github.com/xbmc/xbmc.git
> /usr/bin/git --version # timeout=10
> /usr/bin/git fetch --tags --progress git://github.com/xbmc/xbmc.git +refs/pull/12474/:refs/remotes/origin/pr/12474/ --prune
> /usr/bin/git rev-parse refs/remotes/origin/pr/12474/merge^

{commit} # timeout=10
> /usr/bin/git rev-parse refs/remotes/origin/origin/pr/12474/merge^{commit}

# timeout=10
Checking out Revision be44d74d23294facd47403349709374f5f152b44 (refs/remotes/origin/pr/12474/merge)
> /usr/bin/git config core.sparsecheckout # timeout=10
> /usr/bin/git checkout -f be44d74d23294facd47403349709374f5f152b44
Commit message: "Merge 5f186ed6a2dbb9d2816721ec9ae1439a8ffc6bd3 into fee5e9eb94c6b129c514b3fac7b71db71de4009a"
> /usr/bin/git rev-list aece29c14bdeb045d2fd4e12beff9da42b21e504 # timeout=10
Run condition [Always] enabling prebuild for step [BuilderChain]
Set build name.
New build name is 'pr12474-dd18f54'
>> Job status: [WIN-32] the 'build only if scm changes' feature is disabled.
Starting build job WIN-32.
Pass-through Git Commit: dd18f544300c4e9b284940c92a0687c6081520ca
>> Job status: [WIN-64] the 'build only if scm changes' feature is disabled.
Starting build job WIN-64.
Pass-through Git Commit: dd18f544300c4e9b284940c92a0687c6081520ca
>> Job status: [IOS] the 'build only if scm changes' feature is disabled.
Starting build job IOS.
Pass-through Git Commit: dd18f544300c4e9b284940c92a0687c6081520ca
>> Job status: [IOS-ARM64] the 'build only if scm changes' feature is disabled.
Starting build job IOS-ARM64.
Pass-through Git Commit: dd18f544300c4e9b284940c92a0687c6081520ca
>> Job status: [LINUX-64] the 'build only if scm changes' feature is disabled.
Starting build job LINUX-64.
Pass-through Git Commit: dd18f544300c4e9b284940c92a0687c6081520ca
>> Job status: [LINUX-RBPI] the 'build only if scm changes' feature is disabled.
Starting build job LINUX-RBPI.
Pass-through Git Commit: dd18f544300c4e9b284940c92a0687c6081520ca
>> Job status: [OSX-64] the 'build only if scm changes' feature is disabled.
Starting build job OSX-64.
Pass-through Git Commit: dd18f544300c4e9b284940c92a0687c6081520ca
>> Job status: [Android-ARM] the 'build only if scm changes' feature is disabled.
Starting build job Android-ARM.
Pass-through Git Commit: dd18f544300c4e9b284940c92a0687c6081520ca
>> Job status: Skipping [Android-X86]. This subjob has been disabled.
>> Job status: [Android-ARM64] the 'build only if scm changes' feature is disabled.
Starting build job Android-ARM64.
Pass-through Git Commit: dd18f544300c4e9b284940c92a0687c6081520ca
>> Job status: [LINUX-64-Wayland] the 'build only if scm changes' feature is disabled.
Starting build job LINUX-64-Wayland.
Pass-through Git Commit: dd18f544300c4e9b284940c92a0687c6081520ca

be44d74 is the revision which should have been build, dd18f5 is the one that was build in a previous run, but shouldn't have build again