When reimaging restbase1019 for T295375, puppet runs began to fail. This was out of step with my experience of other reimages, which makes me think this was a recent change. Removing the -D log_json:false argument deployed the services as expected, but this might be indicative of other breakage in scap. Currently we use this argument for all puppet-installed scap services so this will probably break other services if new deploys or reimages are undertaken in future.
Output can be seen in this paste with the override failing and then the install succeeding once the parameter is removed.