In #125 the wrapper was updated to consider an exit code of 2 to be a success, because of a quirk of the plan command. But fmt can also return exit code 2, and it is not considered a success in that case. An example is if you call terraform fmt -check -recursive <dir> and <dir> is not present. In that case a GitHub action running that command will succeed (if you use the wrapper) even though the command failed.