Try this. Move the following to a macro and call it via the actions attribute
on the button:
<$wikify name=newest-tid
text={{{ [prefix<currentTiddler>!sort[created]first[]] }}}
>
<$action-setfield
$tiddler=<<currentTiddler>>
text=<<some macro call to wrap Newest-tid in transclusion braces. This
is not the problem.>> />
</$wikify>
Also are you sure you can't use set/vars instead of wikify?
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