I am experiencing this issue as well when trying to push a geoprocessing tool via the Service Editor in ArcMap 10.6.1. I created a python script and embedded it into a tool. The script runs fine and generates solid output features. However, when I try to publish it as a service, the geometry and schema have disappeared in the Service Editor. I have experimented with setting the schema in the tool parameters to match where the input features are stored. No luck so far... Is there a way the geometry and schema can be restored?
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