Copy-pasting the code from WP:RM to make a requested move renders as:
{{[[:en:Substitution|subst]]:[[Template:Requested move|Requested move]]|NewFoo|reason=Place here your rationale for the proposed page name change....}}
Correctly, you should see:
{{subst:Requested move|NewFoo|reason=Place here your rationale for the proposed page name change...}}
This only happens when the Wikitext editor is enabled.