Reported first [[https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(technical)#Article_"0"_has_no_display_title_in_Vector|on English Wikipedia]] some articles about zero are not showing the first title heading and it's empty in the HTML code.
==Steps to produce==
Go to English Wikipedia's article about "0" https://en.wikipedia.org/wiki/0
The first heading shows 0
It shows nothing. It may contains (editsection) link, I guess that's based on user preference.
This happens only on vector skin, all other skins display normally including mobile ones