namedTag makes Item unusable ?

PHP:

public function test(PlayerLoginEvent $event) {
        $item = (new Item(Item::SNOWBALL, 0, 16, "Testy"))->setCustomName("Testy");
        $namedTag = $item->getNamedTag();
        $namedTag->offsetSet("Test", new FloatTag("Test", 0.05));
        $item->setNamedTag($namedTag);
        $p->getInventory()->setItem(0, $item);
    }

This FloatTag makes the Snowball unusable. Please help!
EDIT: Sometimes (float) 0.0 works!, switched to (float) 0.05
Using PocketMine #4ace4b9

 

PHP:

public function test(PlayerLoginEvent $event) {
        $item = Item::get(Item::SNOWBALL, 0, 1);
        $namedTag = new CompoundTag("", []);
        $namedTag->display = new CompoundTag("display", [
            "Name" => new StringTag("Name", "Testy")
        ]);
        $namedTag->Test = new FloatTag("Test", 0.05);
        $item->setNamedTag($namedTag);
        $p->getInventory()->setItem(0, $item);
    }


 

This made Windows 10 Edition couldn't hold the item (Air instead), and unshootable Snowball on PE.

 

I've just solved this by using this hack before the setItem() function:

PHP:

$item->setCompoundTag($item->getCompoundTag());

This release the cachedNBT and it works. Now i need an explaination for this (and more convenient code if available).

 

Glad you solved it.
I use the code that I just provided in many cases and it works fine for me.