If org-agenda-dim-blocked-tasks is set to 'invisible, then the asterisks for habits of certain headlines in the agenda display in a greyed-out face (dimmed), rather than the white face I'm used to. The headlines are those where, in the agenda display, the text of the headline does not reach the beginning of the habit graph. I discovered that lengthening the heading sufficiently (just adding more text) and rebuilding the agenda makes the asterisks white. Removing the extra text and rebuilding again greys them out again.
I noticed this happening a couple of days ago. What is going? Is this meant to happen, and if not, what can I do about it?