Major - New Cook Error, help? (Logs attached) "Trying to modify UObject map (FindOrAdd) that is currently being iterated."

General Issues and Bug Reporting
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1 
Cooker had an error while cooking this project. Error: errors.com.epicgames.content-service.cook-failure, An error occurred while communicating with the game servers (Content (re)cook error errors.com.epicgames.cookplugin.cookfailure.
JOB_ID=093d2603-18a8-4a04-ba6c-f3e23e2f5f3b
LogWindows: Error: appError called: Fatal error: [File:D:\build\++Fortnite\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectHash.cpp] [Line: 323] 
LogWindows: Error: begin: stack for UAT
LogWindows: Error: === Critical error: ===
LogWindows: Error: 
LogWindows: Error: Fatal error: [File:D:\build\++Fortnite\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectHash.cpp] [Line: 323] 
LogWindows: Error: Trying to modify UObject map (FindOrAdd) that is currently being iterated. Please make sure you're not creating new UObjects or Garbage Collecting while iterating UObject hash tables.
LogWindows: Error: 
LogWindows: Error: 
LogWindows: Error: [Callstack] 0x00007ff6e80ae6ed FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e805bf80 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e8093c7d FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e80954d8 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7f5dc85 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7dd28f9 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6ed60de9c FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6dcdb6ed0 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6dcdb6dcd FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6dcdfd56a FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6da4d2e93 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e80aabce FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6dce12038 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6dcdbb314 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6ed7aada3 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6edd5e9f5 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6edd5acd8 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7c995a0 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7ee5bcf FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7f0a913 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7ee44c6 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7f0a913 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7ee44c6 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7f0a913 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7ee44c6 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7d7f373 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7d80203 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7d632a7 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7d67cb0 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7d6811c FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7d7dfb3 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7d9cca9 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7d9c6ae FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7d6d70d FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e7d6bc71 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e807c398 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6e807bb9b FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f3928623 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f392b60b FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f392d5e9 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f392b2a6 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f0495f1d FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f04dc522 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f04dca6b FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f04e1077 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f04f8642 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f04f7ece FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f02f67f0 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f03108a2 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6da1f5148 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6da1ec8da FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6da1ecc8a FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6da1ef626 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6da200c34 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ff6f7aeb6e6 FortniteContentWorker-Cmd.exe!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ffab4117974 KERNEL32.DLL!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ffad32fa2f1 ntdll.dll!UnknownFunction []
LogWindows: Error: 
LogWindows: Error: end: stack for UAT)., CookJobId:093d2603-18a8-4a04-ba6c-f3e23e2f5f3b