I worked on the original SR that you cited. I am trying to resurrect the reproduction test case, but the test system is currently being uncooperative. I will ask for it to be reset, and try again.
Meanwhile, I need some clarification. Your attached document says "...and then trying to expand the last record, the all the records are getting collapsed.". I'm not sure I understand what you are describing here. Are you saying that the last row that you are trying to expand is staying collapsed?