OK, that helps. First, you're creating a view using Incident and Task SLA, not Task - I see that this caused confusion in the replies (Task SLA is NOT extended from Task, so you need a database view to join them). Second, you don't need to use sys_journal_field (unless there are reasons I'm not aware of).
I have recreated the view as follows and it shows values for Additional comments, Work notes, and Comments and Work notes as you can see below:
This is a standard form (wanted to make sure I exclude PHI).
Unfortunately I cannot type anything into those fields b/c that DB view is live, so it would be visible to the customer and trigger a email notification, However I duplicated the scenario on our Test, and the comments and notes were not available in the report. See below.
Can you open a List View for Incident from the Navigator and click on Personalize List (the gear icon) and add "Comments and Work notes" as shown below? Let's verify if the values show up for a List View first.
