I came across this issue as well. I was passing a hash of hashes to TT and used this method to sort it.
Sample Hash:
%Orders = {};
$Orders{1}{NAME} = 'Bill';
$Orders{1}{STATUS} = 'Complete';
$Orders{2}{NAME} = 'John';
$Orders{3}{STATUS} = 'Pending';
Sort the hash by key value (orderid) descending and output data from the nested hashes:
<table>
<tr>
<th>Order ID</th>
<th>Name</th>
<th>Status</th>
</tr>
[% sortedKEYS = Orders.nsort %]
[% FOREACH skey IN sortedKEYS %]
<tr>
<td>[% skey %]</td>
<td>[% Orders.$skey.NAME %]</td>
<td>[% Orders.$skey.STATUS %]</td>
</tr>
[% END %]
</table>
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