In game #29893034 I cannot choose a Prize on turn 12. When refreshing the page (F5) it is possible to get any of the Prizes. However, when right clicking on the Tournament, only the Duchy is available.
Reloading the old game did not change the result (Chrome, Win10)
Thanks for the report, SkyHard.
I thought that old bug was gone long ago :'(
I'll take a look at it.