Aight, so I have my Pixelmon config file set to where Pokémon will never be aggressive unless in a haunted house or something (DoWildAggression is set to false) for version 8.0.4., since I noticed the level cap was kinda ridiculous in that version and I don't want my starter to faint 10 seconds after I joined my world. I also set the delete unwanted trops thing to true so I won't need to collect stuff I don't want. When I switched to 9.0.0, well... this version just ignores these changes. Wild Pokémon can force me into battle and unwanted drops will not be deleted.
As for Max Mushrooms, they're flat with a black bg and they aren't really dropping nothing. That's about it.