A merge of a merge - is it a bug or something I don't understand

[NeverwinterMoon]

So, if I do something like this:

var a = Kefir.constant(1)
var merge = Kefir.merge([a, a])
merge.onValue()

The output will be 1, 1, end

Now, if I do this:

var a = Kefir.constant(1)
var merge1 = Kefir.merge([a])
var merge2 = Kefir.merge([merge1, merge1])
merge2.onValue()

The output will be 1 and the stream will end and I don't understand why. In my opinion, the first and the second example should work the same and produce: 1, 1, end.

The example above is simplified, but in my real code I have one input stream which I filter in different ways and then merge again, but the core of the problem is what I wrote above.