TYPO3 Core

Create a directory menu with special.value being a mount point (Substitute Mount Point (this page) with Mounted page is not set). E.g.,

lib.menu = HMENU
lib.menu.special = directory
lib.menu.special.value = 6

lib.menu.1 = TMENU
lib.menu.1 {
expAll = 0 # standard configuration for NO, CUR, ...
}
lib.menu.2 < lib.menu.1
lib.menu.3 < lib.menu.2

1st level is shown but once an entry from 1st level become active, 2nd level (and of course 3rd level will never be shown).

How-to reproduce. Set-up your environment with e.g.,

root |-- [1] page1 | `-- [2] page1.1 | `-- [3] page1.1.1 | |-- [4] page2 | `-- [5] page2.1 | |-- [6] pageMP (--> 7) |
`-- [7] sysfolder |-- [8] page3 | `-- [9] page3.1 | `-- [10] page3.1.1 |
`-- [11] page4

Create your menu with TS from this bug's description and let

lib.menu.special.value = 1

You see a menu with

page1
page2

Once you activate page1, you see next level:

page1
page1.1
page2

and same behaviour with page2 active or page1.1 active. Every active page lets you see its children.

Now change entry point:

lib.menu.special.value = 6

You get a menu

page3
page4

But when you activate page3, you don't see page3.1

Now apply patch and test again. Normal menu (page1, page2) still works, menu with mount point now shows

page3
page3.1
page4

When page3 is active and shows

page3
page3.1
page3.1.1
page4

when page3.1 is active.
(issue imported from #M11224)