% echo "<table><tr><td>x</td><td align="center" data-parsoid='{"stx":"row"}'></td><td data-parsoid='{"stx":"row"}'>y</td></tr></table>" | parse.js --html2wt {| |x|| align="center" |||y |}
There should have been a <nowiki/> between the tds so that output looked like |x|| align="center" |<nowiki/>||y
The incorrect html2wt Parsoid output now parses as:
<table><tr> <td>x</td> <td>align="center"</td> <td>y</td></tr></table>