Using Org 9.6 with Emacs 29, write a link: [[123][test]]
Most of the text will then be hidden, with "test" showing as a link, as expected. However if I remove the last ], the link highlighting disappears and only "test" is shown like regular text (/i.e./ instead of "[[123][test]" as would be expected). If I insert a character at the end or move the text, it is updated and "[[123][test]" shows as expected. (This bug does not occur in Org 9.5 for me.)