Variables change after every time I join the world

[Exavior]

I am trying to make a LivingEntity that requests for a random item from an ArrayList when it spawns. It is working but every time I load into the world (Exit the world then join it again) it requests for a different item that it did before.

Ex. It asks for an Egg, then I rejoin the world and it now asks for a Block of Dirt.

I tried using EntityDataAccessor and I cannot figure out a way to use NBT data to save the item and then load it. Can someone point me towards the right direction on how to fix the issue?

Edited April 5 by Exavior

[Exavior]

https://pastebin.com/qSfdyKxX

 

This is only the data part, it is unfinished because I have been changing it a lot.

 

 

[dee12452]

The problem I see you having is every time `addAdditionalSaveData` is called, a new item is randomly selected and saved. What you need to be doing here is saving what is already selected, as this is called every time the entity is saved (i.e. when the world is closed, hence your problem).  

What you can do instead is just save whatever's defined by your EntityDataAccessor in addAdditionalSaveData.