the ChangeDimension packet doesnt appear to exist (Change the nether portal destination)

[JSJBDEV]

I am using the code

netevent.raw(PacketId.ChangeDimension).on((ptr,size)=>
{
console.log(Packet Id: ${ptr.readUint8()});
const dimension = ptr.readVarInt();
const x = ptr.readFloat32();
const y = ptr.readFloat32();
const z = ptr.readFloat32();
console.log(changing dimension: ${dimension} ${x} ${y} ${z});

});

but I never get a response, furthermore, it doesn't seem to appear in console for being received as a packet at all, am I doing something wrong or is this a bug?
(I have tested this with entities and players moving between the nether and overworld, and a player into the end)

[JSJBDEV]

so I actually did a bit of research into this and found that the PlayerAction for change dimension is called when you arrive at your new dimension which works to some extent, but I would like to be able to interupt and modify this action to change where there portal leads

[karikera]

it seems the change dimension packet is sent from the server.
and I realized send packet listeners are broken.
btw if you cancel the sent packets. the game will make a glitch about this.

it seems it's not easy to change the portal task.

[JSJBDEV]

Im starting to write some other methods and programs for a project im working on so If I come across any other things I will make an issue. when you say send packet listeners are broken, do you mean that I cant send packets? from what I can tell it is the only way to construct a modal form to the player

[JSJBDEV]

if I cant change the portal task I can try and find other things like it.

[JSJBDEV]

since I dont think this deserves another issue as it may be related, I was trying to send a ModalFormRequest to the player so I modified the example code where a text packet is sent to do this

// sendPacket
    setTimeout(()=>{
        console.log('packet sended');

        const fancyPacket = createPacket(PacketId.ModalFormRequest);
        fancyPacket.setUint16(0);
        fancyPacket.setString(`{"type": "form","title": "test title","content":{},"buttons":{}}`);
        sendPacket(networkIdentifier,fancyPacket);
        fancyPacket.dispose();
    }, 10000);

but I keep on getting Error: Structured Exception: STATUS_ACCESS_VIOLATION(0xC0000005) (specifically on the sendPacket line) which I see is because of what looks like malformed strings in the code, am I doing this wrong?