TYPO3 Core

I suggest ignoring the shortcut mode when a page is explicitly set...

update

page 1
-----> subpage 1
-----> subpage 2
------> sub to subpage 2
-----> subpage 3

settings for page1

is ok:
_____
shortcut
shortcut page: subpage1
shortcut mode: first subpage

is ok too:
______
shortcut
shortcut page: subpage2
shortcut mode: first subpage

the following gives the error stated above:
_______
shortcut
shortcut page: sub to subpage 2
shortcut mode: first subpage

so it depends somehow on the level...

btw: it's the same with "random subpage" selected

Reproduced.

The bug is not too critical, since setting both options is a logical error of misunderstanding of the concepts

Actullay I was a bit too quick there, this is not a bug.

It works this way: If both page and mode is set, it will take, in example, a random subpage of the page specified, if it doesn't exist, it will obviously fail.

I can't reproduce your first example it should fail, if this is not the case, please let me know. The other two behaves correctly.

Admitted that it is not obvious that this is the behaviour, but it makes sense.

-julle