It would be nice if it tried to place the picked wildberries in the player's inventory slots before falling back to spawning it as an entity in the world.

Suggested implementation:

if (!player.addItemStackToInventory(stack)) {
    Block.spawnAsEntity(world, pos.offset(player.getHorizontalFacing().getOpposite()), stack);
}

Alternatively, player.inventory.addItemStackToInventory(stack) will perform the same action, but without an equipping sound.

About to release an update with this included.