List of steps to reproduce (step by step, including full links if applicable):

• Revert :w:vi:Template:Đổi tên2 to revision 66387992
• Go to :w:vi:Wikipedia:Đổi tên người dùng and purge the cache (if necessary)
• Click on a random "Đổi tên người dùng" link, preferably at the "Hộp cát → SandboxNDKDD" section, since Hộp cát is my sandbox account.

What happens?:

• The rendered link will be similar to https://meta.wikimedia.org/w/index.php?title=Special:GlobalRenameUser&reason=per+%5B%5Bw%3Avi%3ASpecial%3APermalink%2F-%7Crequest+on+viwiki%5D%5D&oldname=T%C3%AAn+c%C5%A9&newname=T%C3%AAn+m%E1%BB%9Bi
  • Decode: "per [[:w:vi:Special:Permalink/-|request on viwiki]]"
• However, the link on Template:Đổi tên2 works fine.

What should have happened instead?:

• REVISIONID should have output the current revision id of the page, and therefore the "reason" parameter will be decoded as "per [[:w:vi:Special:Permalink/Revision ID|request on viwiki]]" when shown in log.