Rather than discussing bugs & issues, even before the game is released(surely they ought to be there in any game as no game can be developed bug free)...(a demo is just a "demo" not a final version), which they would surely be working on it & more so only after the game is released...Merely based on Practice mode one cannot simply judge about bugs... (other than what you actually see)
Sole purpose of Demo was to have early access to Academy so the community can start creating awesome creations (teams players stadia kits bats etc), which this community is famous for...& the most awaited addition this year being the Scenario creator/editor...where the list can be endless..& that by the time the game releases we have plenty of scenarios to play & enjoy...