I'm confused on the pitch accent for the phrase 止まらないんだ.
I know that the pitch accent for 止まらない is 平板型 (とまらない{LHHHH}). From my own experience, I think that the accent for 止まらないんだ looks like this とまらないんだ{LHHHLLL}. However, OJAD tells me that the downstep should be at the い position. So, it will look like とまらないんだ{LHHHHLL} instead.
Which one of these pitch accents is the correct one?