When editing an item using special pages like http://m.wikidata.beta.wmflabs.org/wiki/Special:SetLabelDescriptionAliases/Q63529/en one gets redirected to the desktop version of the site. The action parameter is generated by $this->getPageTitle()->getFullUrl() in SpecialModifyEntity which seems to ignore the mobile "m" prefix in the url.
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|Open||None||T96040 Wikibase special pages (tracking)|
|Resolved||Bene||T103996 [Task] Show edit links to special pages in mobile view|
|Resolved||Jdlrobson||T78430 [Epic] Getting Wikidata to render nicely on mobile web|
|Duplicate||None||T103428 [Bug] Special pages don't lead to mobile version|
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Special pages in mediawiki core usually link to /w/index.php and have the title param set as a hidden form value. I'm not sure if we want to do the same in Wikibase but at least we shouldn't use the full url.