In wikis with variant, change the uselang (not variant) to the language without variant code it will add unneeded -{R|link}-.
how to
Just go some variantable-language wikis, for example zhwiki without setting language just leave the interface language zh
and go global userpage (I have seen this on other pages, but I did not find the relevant page), the footer with a link
what happens
It shows the link in -{R| and }-
(zh)
what expected
make the -{R|}- Invisible just like if you choose some variant for your interface language
(e.g. zh-hans)