[LH4104] Editing: Moving Item to top of document changes its style No Style

When I edit something, moving one of item(Paragraph) to top makes its style to “No Style”.
Whether is on any mode without Full Screen(Ctrl + Alt + Up/Down take different action).

2019101900004 Video_2019-10-19_070109.gif
and It seems inheritance style of its previous paragraph after moving.
I’m not sure this is bug or not. but it’s weird to me.

Thanks. This has been filed.