Text Finder is configured to "search the console output" and set build to "unstable if found". The test script returns a non-zero value, and the plugin is able to find the string, however, the test run is still marked as failure.

[X] Also search the console output
Regular expression: "git call failed"
[ ] Succeed if found
[X] Unstable if found

The console log indicates the plugin does find the string, but the build is still failed, instead of marked as unstable.