To reproduce:
- Open an anonymous desktop browser window.
- Go to https://ka.wikipedia.org/wiki/ABBA .
- Hover over a blue link. A popup appears.
- Click the blue link at the bottom of the popup.
Observed: A page opens saying that the page doesn't exist.
Expected: An article page is supposed to open.
The likely reason for this bug is probably the Georgian alphabet Unicode capitalization issue, which is described in T230559 and T208139. The solution proposed by @Esanders in T230559 may also fix this bug, but I'm creating a separate task anyway because it's conceivable that that there is another JavaScript issue.