[CLIENT] Spinner does not disappear over the position I took in Team Builder

I joined a team as Marksman in Team Builder mode, as the 4th player to join. The whole time we waited for a 5th, there was still a spinner icon over the Marksman position in the small map. When the 5th player joined, the spinner was replaced by my summer picture.

I've only seen this once, so I'm not sure how it reproduces. Screenshot attached.