DEPRECATED warning does not display in Notebooks

[JamesDeFabia]

I created an ECL Notebook with an ECL code cell with this code:

personRecord := RECORD
STRING UID;
STRING first_name;
STRING last_name;
STRING address;
STRING city;
STRING state;
STRING zip;
END;
person := DATASET([{'923','James','Jones','123 Elm Street','Hollywood','FL','33022'},
{'924','Sally','Jones','22 Main Street','Tampa','FL','33604'},
{'925','Jose','Gomez','111 Biscaya Lane','Miami','FL','33101'},
{'926','Adam','Wesson','77 Sunset Blvd','Boston','MA','02108'},
{'927','Evelyn','Murray','740 SW 10th Street','Boston ','MA','02116'},
{'928','Joe','Yung','7511 Simson Avenue','Chicago','IL','60131'}], personRecord);

OldSort := SORT(person,first_name) : DEPRECATED('Use NewSort instead.');
NewSort := SORT(person,-first_name);
  
OUTPUT(OldSort); 
  // produces this warning:
  // Definition OldSort is marked as deprecated. Use NewSort instead.

When I run it, I should see a warning, but I only see the results