{{ {{PAGENAME}} }} seems to work. {{ {{PAGENAME}}}} and {{{{PAGENAME}} }} work too.

Same thing with {{{{FULLPAGENAME}}}}

And {{{{TALKPAGENAME}}}}

And not just magic words. Just created [[user:Base/test]] with "test", but {{{{User:Base/test}}}} is shown unparsed the same way.

Can someone please provide a hyperlink to a test page showing this behavior?

https://test.wikipedia.org/wiki/User:Base/T136515 (despite it being in my userspace feel free to modify)

In T136515#2337442, @Base wrote:

{{ {{PAGENAME}} }} seems to work. {{ {{PAGENAME}}}} and {{{{PAGENAME}} }} work too.

IMO, the second method here is the right way to do this, and this isn't a bug but rather intentional behavior.

In T136515#2337704, @Jackmcbarn wrote:

{{ {{PAGENAME}} }} seems to work. {{ {{PAGENAME}}}} and {{{{PAGENAME}} }} work too.

IMO, the second method here is the right way to do this, and this isn't a bug but rather intentional behavior.

Is that documented somewhere? :-/

{{{{PAGENAME}}}} is interpreted as a named parameter {{{PAGENAME}}} inside single curly brackets.

On https://en.wikipedia.org/wiki/Template:X1 I previewed this:

{{{{PAGENAME}}}}

<noinclude>Transclusion: {{X1|PAGENAME=test}}</noinclude>

Result:

{{{{PAGENAME}}}}

Transclusion: {test}

Why would you need this to work?

It's your job as the editor to write wikitext that MediaWiki can parse properly. Also the following works if you really want this sort of thing:

{{<nowiki></nowiki>{{PAGENAME}}<nowiki><nowiki>}}

If you want the template, instead you can use a null comment:

{{<!-- null-->{{PAGENAME}}<!-- null-->}}