From the attached document, I understand that for the workobject (S-554483), the section 'ResolutionComments' is not visible. If the reported behavior is only observed for this workobject, then compare working and non-working workobjects. I suspect the ResolutionComments might be shown based on some visibility condition if it is embedded in some other section.
I think you are using older version of PRPC i.e. 6.x. You can make use of UI Inspector to see the top level section and analyze if ResolutionComments section is embedded in it.
So I take it from your attachment in both cases you performed the same reopen local action on a case and in one scenario you see a new flow assignment aligned to the coupled WO and in the other you do not. To diagnosis you are going to want to trace the submission and then review the pyWorkPage in the working case to see where the flow was added to the page and then use this information to review the non-working trace up until the same point.