You understand maybe better why providing a clear scenario helps ...
But here this is normal for me as you have set to AB/Fader.
You can play your cuelist with Go, of with fader. But not the both for the launch. This is not a bug.
First go activate the cue 1 in respect to the cue fade time
Then as fader never reach the 100% but the cue 1 is active, so does nothing
Arrived to 100% for the first time, it change the fader way for the next cue fading.