and change the heading style in the second line (for example), you can change it to all heading types, but you cannot simply remove the heading style without a negative sideeffect:
when clicking on (heading) Normal, a previous list style of that line (here: bulleted, unordered list) is removed.
When you have an ordered (or unorded) list
and change the heading style in the second line (for example), you can change it to all heading types, but you cannot simply remove the heading style without a negative sideeffect:
This should not happen.