In ruwiki I try to create a translation for https://en.wikipedia.org/wiki/User:Сунприат/sandbox
But the translator automatically replaces the name of the page from "User:Сунприат/sandbox" to "Участник:Сунприат/sandbox". And of course a page "Участник:Сунприат/sandbox" does not exist in enwiki/ "Page "Участник:Сунприат/sandbox» can not be found on the English Wikipedia"
also https://en.wikipedia.org/wiki/Wikipedia:Sandbox -> Википедия:Sandbox