Hey there, I am trying to create an Ephemeral data context from a File based one. I tried to use EphemeralDataContext(context.get_config_with_variables_substituted()) for this, where context is a FileDataContext . This works (after adding root_directory to the filesystem-based stores) except the data sources are not populated. In fact, the original FileDataContext-based context.get_config_with_variables_substituted() returns a DataContextConfig object with datasources: {} , even though context._datasources is populated. Is this a bug?