Sprint jersey switches on/off

Hi, today on sprinter paradise with migael i achieved the sprint jersey on tower sprint.

In the following laps the jersey constantly turns off and on…

The sprint jersey symbol left to my name tages stays on constantly though.

What I noticed is that wenn the jersey disappears: an arrow appears within the green sprint sybol.

Which makes me think zwift either doesn’t know which route I’m on or it doesn’t comprehend which sprint course is valid for the jersey.