I have run into situations where the PopUp List does not show up.
Example: SELECT * FROM SCHEMA.YOURTABLENAME TM WHERE TM. The popup does does not work all of the time here. You can see the swirling circle so you know the program is thinking about doing something. But the popup does not arrive. However, I have been successful in having this type of statement work.
If you type: SELECT * FROM SCHEMA.YOURTABLENAME TM WHERE SCHEMA.YOURTABLENAME. The popup arrives. (If you quantify your schema and table name, it seems to work.)
From my testing if I quantify your schema.yourtablename the popup works every time so far.