Unable to launch packaged project, Error: Launch failed! Unknown Error

Hello, I’m trying to package an Unreal app, but it crashes on launch, with an unclear error. I’ve tried disabeling custom plugins, set the basic 3rd person map and base game modes / instance to just get it to launch with no success.

Here is the relevant log :

LogPlayLevel: Error: UAT: [2023.09.12-09.09.36:369][  0]LogWindows: Error: appError called: Fatal error: [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\ShaderCompiler\ShaderCompiler.cpp] [Line: 7173]
LogPlayLevel: UAT: Missing global shader FInputTextureConvertPS<false>'s permutation 0, Please make sure cooking was successful.
LogPlayLevel: UAT: 
LogPlayLevel: UAT: 
LogPlayLevel: UAT: 
LogPlayLevel: UAT: 
LogPlayLevel: UAT: 
LogPlayLevel: Error: UAT: [2023.09.12-09.09.36:369][  0]LogWindows: Windows GetLastError: L?op�ration a r�ussi. (0)
LogPlayLevel: UAT: [2023.09.12-09.10.36:382][  0]LogWindows: Could not start crash report client using ../../../Engine/Binaries/Win64/CrashReportClient-Win64-Debug.exe
LogPlayLevel: UAT: [2023.09.12-09.10.36:382][  0]LogMemory: Platform Memory Stats for Windows
LogPlayLevel: UAT: [2023.09.12-09.10.36:382][  0]LogMemory: Process Physical Memory: 588.71 MB used, 591.05 MB peak
LogPlayLevel: UAT: [2023.09.12-09.10.36:382][  0]LogMemory: Process Virtual Memory: 699.58 MB used, 700.37 MB peak
LogPlayLevel: UAT: [2023.09.12-09.10.36:382][  0]LogMemory: Physical Memory: 39581.57 MB used,  91198.20 MB free, 130779.78 MB total
LogPlayLevel: UAT: [2023.09.12-09.10.36:382][  0]LogMemory: Virtual Memory: 53258.88 MB used,  208592.91 MB free, 261851.78 MB total
LogPlayLevel: Error: UAT: [2023.09.12-09.10.36:382][  0]LogWindows: Error: begin: stack for UAT
LogPlayLevel: Error: UAT: [2023.09.12-09.10.36:382][  0]LogWindows: Error: === Critical error: ===
LogPlayLevel: Error: UAT: [2023.09.12-09.10.36:382][  0]LogWindows: Error:
LogPlayLevel: Error: UAT: [2023.09.12-09.10.36:382][  0]LogWindows: Error: Fatal error: [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\ShaderCompiler\ShaderCompiler.cpp] [Line: 7173]
LogPlayLevel: Error: UAT: [2023.09.12-09.10.36:382][  0]LogWindows: Error: Missing global shader FInputTextureConvertPS<false>'s permutation 0, Please make sure cooking was successful.
LogPlayLevel: Error: UAT: [2023.09.12-09.10.36:382][  0]LogWindows: Error:
LogPlayLevel: Error: UAT: [2023.09.12-09.10.36:382][  0]LogWindows: Error:
LogPlayLevel: Error: UAT: [2023.09.12-09.10.36:382][  0]LogWindows: Error:
LogPlayLevel: Error: UAT: [2023.09.12-09.10.36:382][  0]LogWindows: Error: end: stack for UAT
LogPlayLevel: UAT: [2023.09.12-09.10.36:404][  0]LogExit: Executing StaticShutdownAfterError
LogPlayLevel: UAT: [2023.09.12-09.10.36:404][  0]LogWindows: FPlatformMisc::RequestExit(1)
LogPlayLevel: UAT: [2023.09.12-09.10.36:404][  0]LogWindows: FPlatformMisc::RequestExitWithStatus(1, 3)
LogPlayLevel: UAT: [2023.09.12-09.10.36:404][  0]LogCore: Engine exit requested (reason: Win RequestExit)
LogPlayLevel: Error: UAT: ERROR: Client exited with error code: 3 (see C:\Users\louis.EVEREST8849\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_5.2\Client.log for more info)
LogPlayLevel: UAT:        (see C:\Users\louis.EVEREST8849\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_5.2\Log.txt for full exception trace)
LogPlayLevel: UAT: AutomationTool executed for 0h 3m 39s
LogPlayLevel: UAT: AutomationTool exiting with ExitCode=1 (Error_Unknown)
LogPlayLevel: Completed Launch On Stage: Run Task, Time: 62.138044
LogPlayLevel: UAT: BUILD FAILED
PackagingResults: Error: Launch failed! Unknown Error

Client.log and Log.txt have mostly the same contents.
Packaging a clean Third person game works.

Any help appreciated,

Thanks