pandoc-3.10: test/command/4794.md

```
% pandoc -f markdown -t mediawiki
| Column1 | Column2 | Column3 |
| ------- | ------- | ------- |
| text    |         | text    |
^D
{| class="wikitable"
|-
! Column1
! Column2
! Column3
|-
| text
|
| text
|}

```