Submarine Combat - Choose Target "bug"?

[AlbertN]

Greetings,

I've recently encountered a situation that I suspect it is a bug.

In a naval combat situation, Submarine Combat was selected - but there were 0 Convoys in the Sea Zone. Only other ships.
As there were a total of 11 Surprise Points - 4 went off to choose the Combat Type.

Then I thought, with 7 remaining points, I can waste 1 and choose 2 targets.
Something that has worked when actually there were convoys in the sea and other ships.
In this occasion though, the game skipped the part whole of letting me choose targets (after investing the Surprise Points in that option). The Submarines were doing 2 X and 2 D and some more aborts ... and I was fully conscious I'd have lost the 2 D part of the result, by being able to choose anyhow the 2 X.

It just has not happened so I think it is a bug.

[Centuur]

If those ships are not in the "0" box, you can't choose those ships as targets in a submarine combat:

RAW:

If no convoy points are included (only possible if you spent surprise
points to choose a submarine combat ~ see 11.5.7) then you fight on
the ‘0’ ships row.