Look at https://en.wikipedia.org/wiki/User:Amire80/tarask : the interlanguage link there has the "be-tarask" prefix, but the href of the link is be-x-old.**Steps to reproduce**
This doesn't break the link because be-x-old redirects to be-tarask, but it should point directly to be-tarask.wikipedia.org. # Open any page on Wikipedia
# Insert `[[:be-tarask:Some test page]]`
# Save page
# Open saved page and mouse over the link
# In web browsers there is a full link address shown in status bar at the bottom. Look on its content
I don't remember much about how the classic (non-Wikibase) interlanguage links work, but if I'm not mistaken, it's mostly a matter of updating the interwiki table, and probably the scripts that populate it (I remember there was such a script under maintenance/ in the past, but I can't find it now).**Expected behavior**
There should be `be-tarask.wikipedia.org/wiki/Some test page`
(It also makes sense to run a bot on all the Wikimedia wikis to update existing classic interlanguage links to be-tarask.)**Current behavior**
There actually is `be-x-old.wikipedia.org/wiki/Some test page`. It looks like `[[:be-tarask:]]` redirects to `be-x-old.wikipedia.org`, which redirects to `be-tarask.wikipedia.org`, which is unnecessary double redirect.