hi @ToasterMRVL ,
Well tried you island this works well, even the In-Island Transactions work properly.
Decided not to actually buy the jewels, bit expensive for my tastes 
.
Been in and out of games several times and no problems.
The reason for this is possibly that the DirectX 12 graphics drivers have a problem.
There have been black screens coming back to lobby and crashes.
The problems occur on all sort of pcs with different graphics cards and different software drivers across many versions of Windows 11.
The official way to switch to DirectX 11 is to use a start up switch.
How do I force Fortnite to use DirectX 11?
To make this easier this pictures shows Epic Support changes to the Epic Games Launcher for Fortnite
Please could you try this on your PC and see if this changes/fixes the problem for you