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{|
|[[abc|def]]|ghi
|}

produces an unexpected result. On the live site:

<table>
<tr>
<td>&lt;  class="new" title="Abc"&gt;&lt;/&gt;&gt;ghi</td>
</tr>
</table>

In HEAD:

<table >
<tr >
<td <!--    -->>ghi
</td></tr></table>

The table syntax
| text | some more
considers "text" as table cell properties, e.g. align="center"
style="background:#333333;"
[[abc|def]] is not a valid option, so it get's removed.

{|
|| [[abc|def]] || ghi
|}

or

{|
| [[abc|def]]
| ghi
|}

work as intended.

Invalid syntax.