Issue with global_start and navbar

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I have a custom template, I'm trying to insert it into the navbar using a $navbar2

I have a plugin for global_start with the contents of

eval('$navbar2= "' . fetch_template('navbar2') . '";');

But when i place $navbar2 in my navbar template it does not work.

If i place $navbar2 in my header template it works.

Should I be using a different hook location?