Adding a tag to a document which contains translations will display several times the same document as containing the tag

Steps to reproduce:

• go to Main.Welcome page (which has translations in almost all supported langauges)
• Add a tag, let's say "foo"
• On Main.Welcome, click on the tag to go to the tag page.

You will see that Main.Welcome is listed many times, because of the translations.

Note: Multilingual is set to NO, Supported languages has only en, and default language is en.

From a technical POV, it seems that $xwiki.tag.getDocumentsWithTag($tag)) does not return only unique pages.