When I set my “Chunks to Remove” array as I am, does this copy my “Loaded Chunk IDS” array or make my “Chunks to Remove” array a reference to my “Loaded Chunk IDS” array?
Why don’t you check for yourself? ;] if "chunk to Remove changes will appear in “Loaded Chunk IDS” it means it’s a refrence
In C++ it does not work like that, as you can decide whatever variable is a pointer/refrence (TArray*) or container (TArray). One of complements from C++ opposition in this community is that you need to learn about that… but as you can see sometimes it’s very useful 
You could try workaround this with “Append Array” node or some other array operation nodes
I was hoping I wouldn’t have to waste the time doing so when I got back to working on it. The documentation says nothing about it. As far I can tell, there is no way to copy an array other than looping through it. If it works similar to a c++ array, then I would expect that “Chunks to Remove” is a reference variable.
You are right. I’m getting my C# and C++ mixed up. I did the testing and it does work the way I want it to.
For those interested, this method does copy the array.