Changed subject line to clarify.

The 'pipe trick' name expansion is a transformation performed at page save time
and operates on input text, so won't apply to the results of a template expansion.

The pipe trick also doesn't work in this case:

[[{{ns:project}}:my topic|]]

However, this works:

[[{{ns:project}}:my topic|my topic]]

The pre-save-transform step can't predict to what the templates or arguments will expand in the future, so there is no way to do a correct replacement.

Suggesting WONTFIX

conrad.irwin wrote:

Fixed in r62069