In jawiki, if you access a page name that uses non-major Cyrillic characters, you will not be able to jump to the next page.
This only happens in Firefox. There was no problem with Chrome and Edge.
Operating environment
・ Windows10 64bit Japanese Edition
・ Firefox 93.0
Target page
・ Ӑ -jawiki
・ Ӕ -jawiki
・ Ӄ -jawiki
・ Ӆ -jawiki
etc ...