Thanks for the report R1N9 ♥
It's not a real bug. The referee is really OP and if the serve goes out, he will know before the ball landing. For the match point, it results of this "too fast" ending screen. The new system we made in the Beta fixed that but I'm gonna take a look if I can fix it in the Alpha as well ;)
However, your screenshot is quite useful cause I see that "MATCH POINT" is still visible where it should not. I've to fix it :D