it appears that when viewing the training stress view in the WebUI, Zwift races are for some reason shown as a regular workout - power profile, TSS and the whole lot - instead of the more minimalistic tile normally used for planned zwift races. This only happens in the WebUI, in the app everything looks fine.
From what I remember, the Zwift race was already specified when creating the plan - no idea where this workout picture is coming from. Maybe what the AI would like me to do instead of the race?
To add to the originally mentioned issue, I now also get a workout associated to my Zwift race. I did definitely not do a workout, nor did I manually associate or plan one. From what I can tell, this happened for every race in my current plan.