This also occurs for us when we package our game in Development on MacOS using RunUAT:
Start UAT: mono AutomationTool.exe BuildCookRun -project=/Users/jenkinsci/CI/workspace/Galacide/Galacide/Galacide.uproject -noP4 -ForceDebugInfo -clientconfig=Development -serverconfig=Development -allmaps -stage -iterate -cook -build -platform= -archive -archivedirectory=/Users/jenkinsci/CI/workspace/steamworks/tools/ContentBuilder/content/Galacide//Development
Automation.ParseCommandLine: Parsing command line: BuildCookRun -project=/Users/jenkinsci/CI/workspace/Galacide/Galacide/Galacide.uproject -noP4 -ForceDebugInfo -clientconfig=Development -serverconfig=Development -allmaps -stage -iterate -cook -build -platform= -archive -archivedirectory=/Users/jenkinsci/CI/workspace/steamworks/tools/ContentBuilder/content/Galacide//Development -compile
MacOS Sierra 10.12.6
iMac (21.5-inch, Late 2013)
Processor: 3.1 GHz Intel Core i7
Memory 16gb 1600 MHz DDR3
Graphics NVidia Geforce GT 7500M 1024 MB