First of all, there was no such problem in older versions. With the new version, letters such as (ş,ö,ç) in discussion titles appear broken in the URL.
Visual and formed link example:

Link: https://domain.tld/d/1-metin-edit%C3%B6r%C3%BC-kullan%C4%B1m-rehberi
There is no such problem in the Flarum demo:

URL: https://demo.flarum.site/d/43-scscuou-mean-thats-all-siscik
Code Output php flarum info:
Flarum core: 1.7.0
PHP version: 8.0.28
MySQL version: 8.0.32-cll-lve
Loaded extensions: Core, date, libxml, openssl, pcre, sqlite3, zlib, bz2, calendar, ctype, curl, hash, filter, ftp, gettext, gmp, SPL, iconv, json, pcntl, readline, Reflection, session, standard, shmop, SimpleXML, mbstring, tokenizer, xml, i360, bcmath, dom, fileinfo, gd, imap, intl, exif, mcrypt, mysqlnd, mysqli, PDO, pdo_mysql, pdo_sqlite, Phar, posix, soap, sockets, xmlreader, xmlwriter, xsl, zip
+---------------------------------+---------+--------+
| Flarum Extensions | | |
+---------------------------------+---------+--------+
| ID | Version | Commit |
+---------------------------------+---------+--------+
| flarum-flags | v1.7.0 | |
| flarum-tags | v1.7.1 | |
| flarum-sticky | v1.7.0 | |
| fof-oauth | 1.3.0 | |
| flarum-suspend | v1.7.0 | |
| fof-pages | 1.0.4 | |
| flarum-approval | v1.7.0 | |
| afrux-forum-widgets-core | v0.1.7 | |
| v17development-seo | v1.8.0 | |
| the-turk-stickiest | 3.0.1 | |
| nearata-copy-code-to-clipboard | v2.1.0 | |
| ianm-syndication | 1.3.0 | |
| ianm-oauth-twitch | 0.1.1 | |
| ianm-oauth-reddit | 0.1.0 | |
| glowingblue-password-strength | 3.1.0 | |
| fof-user-directory | 1.2.3 | |
| fof-user-bio | 1.1.1 | |
| fof-upload | 1.2.3 | |
| fof-terms | 1.2.0 | |
| fof-split | 1.1.0 | |
| fof-sitemap | 2.0.1 | |
| fof-share-social | 1.1.2 | |
| fof-reactions | 1.1.5 | |
| fof-pretty-mail | 1.1.1 | |
| fof-nightmode | 1.5.1 | |
| fof-merge-discussions | 1.3.1 | |
| fof-links | 1.1.3 | |
| fof-formatting | 1.0.2 | |
| fof-best-answer | 1.2.4 | |
| fof-bbcode-details | 1.1.0 | |
| flarum-subscriptions | v1.7.0 | |
| flarum-statistics | v1.7.0 | |
| flarum-mentions | v1.7.0 | |
| flarum-markdown | v1.7.0 | |
| flarum-lock | v1.7.0 | |
| flarum-likes | v1.7.0 | |
| flarum-lang-turkish | 1.15.0 | |
| flarum-lang-english | v1.7.0 | |
| flarum-emoji | v1.7.0 | |
| flarum-bbcode | v1.7.0 | |
| davwheat-custom-sidenav-links | 1.0.1 | |
| datlechin-link-preview | v1.3.2 | |
| clarkwinkelmann-group-list | 1.0.0 | |
| clarkwinkelmann-circle-groups | 1.0.1 | |
| blomstra-usercard-stats | 0.1.2 | |
| blomstra-sort-order-toggle | 0.2.0 | |
| blomstra-oauth-apple | 0.1.2 | |
| blomstra-fontawesome | 0.1.5 | |
| askvortsov-markdown-tables | v1.2.1 | |
| askvortsov-discussion-templates | v0.8.3 | |
| afrux-top-posters-widget | v0.1.4 | |
| afrux-online-users-widget | v0.1.6 | |
| afrux-news-widget | v0.1.1 | |
| afrux-forum-stats-widget | v0.1.1 | |
| acpl-mobile-tab | 1.1.1 | |
+---------------------------------+---------+--------+
Base URL: https://
Installation path: /home/httpdrnm1/public_html
Queue driver: sync
Session driver: file
Scheduler status: Never run
Mail driver: smtp
Debug mode: off