At https://en.wikipedia.org/w/index.php?title=Flight_endurance_record&oldid=571122193#Free_Balloon.2C_Manned the table begins with an empty row where there would normally be a header:
{|class="wikitable"
| - |
| - |
| content |
In view mode this empty line is not shown, but it does appear in VE.
Testing at https://en.wikipedia.org/w/index.php?title=User:Thryduulf/sandbox&oldid=571124234#Tables_with_empty_rows shows that the same thing happens, wherever the blank line is in the table. Oddly though the line is shown at full height when its in last position but ~half height elsewhere.
In itself this isn't a problem, it's just different to what happens in view mode where the second |- is ignored.
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Severity: minor