| matmarex added a comment. |
This is definitely not caused by https://gerrit.wikimedia.org/r/c/mediawiki/core/+/314725. That patch actually fixed a similar issue to this, but with characters from other alphabets (T147646). It does nothing about Georgian scripts though.
The problem here is that web browsers have already been mostly updated to support Unicode 11, while the PHP running on Wikimedia servers has not. And like @Alan.H says above, Unicode 11 introduced a new set of Georgian characters (Mtavruli script) and assigned them as uppercase variants of the existing Georgian characters (Mkhedruli script).
Some relevant Wikipedia articles about the scripts, which clearly state that we should not be using Mtavruli characters for the first letter of titles written in Mkhedruli:
In Mkhedruli, there is no case. Sometimes, however, a capital-like effect, called Mtavruli, "title" or "heading", is achieved by modifying the letters so that their vertical sizes are identical and they rest on the baseline with no descenders. These capital-like letters are often used in page headings, chapter titles, monumental inscriptions, and the like.
Mtavruli letters were added in Unicode version 11.0 in June 2018.[86] (…)
Mtavruli is defined as the upper case, but not title case, of Mkhedruli (…)
_javascript_ code not matching PHP code because of this is one problem, but another is that PHP will also eventually be updated, and then all of the page titles on Georgian Wikipedia are going to change to the incorrect form! We have time to fix this though: Unicode 11 support is in PHP 7.3, while we're currently still working on upgrading to PHP 7.2.
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