I have noticed this as well, me on Monza bike v1.1, the problem corner you notice it the most.
Like you said it sounds like TC kicking in, but i ride with TC off. so that cant be it.
I think its due to a certain type of track grip what is used for that part off track. But just guessing here.
Didn't try Sachsenring NC yet , will try l8r this week.