Various blocks drop items when broken in creative. They even bypass the gamerule doTileDrops, which is designed to make block drops not occur.
These blocks include:
PC (pixelmon:pc), Cooking Pot (pixelmon:cooking_pot), Infuser (pixelmon:infuser), Ranch Block (pixelmon:ranch), Fossil Machine (pixelmon:fossil_machine), Fossil Cleaner (pixelmon:fossil_cleaner), Trade Machine (pixelmon:trade_machine), Cloning Machine (pixelmon:cloning_machine), Fridge (pixelmon:fridge), Tree (pixelmon:tree), Fossil Display (pixelmon:fossil_display), Big TV (pixelmon:tv3), Old TV (pixelmon:tv), Clothed Table (pixelmon:clothed_table), all twelve colours of Water Float (pixelmon:gray_water_float, etc), all twelve colours of Vending Machine (pixelmon:blue_vending_machine, etc), all 12 colours of Pokéball Rugs (pixelmon:blue_rug, etc), and all 16 colours of Couches (pixelmon:blue_couch, etc).