Create a 3-line file named foobar.org containing exactly this: * foo ** bar baz
(So the first character of the file is *.) Type emacs -Q foobar.org and type TAB M-: (isearch-forward) RET b RET (this folds everything, then calls the isearch-forward function, searches for b which will unfold everything and position the point on the second line). Now type TAB: this should fold the second heading only, but it will fold everything. And in fact you can try moving around and pressing TAB again as many times as you want: you will never be able to fold only the second heading again. Note that replacing M-: (isearch-forward) in the above sequence with M-x isearch-forward does NOT trigger the bug, instead it does produce the desired behaviour. In GNU Emacs 30.1 (build 1, x86_64-redhat-linux-gnu, X toolkit, cairo version 1.18.2, Xaw3d scroll bars) of 2025-04-08 built on 801fee700660491d8dc8419bf4a7391e (using Org mode version 9.7.11)
