The down-stem note has parentheses around the notehead, but for some reason the up-stem notehead also gets affected, and I cannot allow that to happen.
Is there a remedy? There probably is — preferably something other than removing the parentheses or creating an ossia stave just for that one note.
The issue is sadly that 99,5% of my work is composing and the last 0,5% is layout (not my favourite job). My notation entry skills have therefore evolved to much higher level and layout skills lag behind. Should have found this out myself