I have the same issue with UE 4.25.3 when add c++ class to bp project. I have this error in log:
[SPOILER]LogOutputDevice: Error: === Handled ensure: ===
LogOutputDevice: Error: Ensure condition failed: FModuleManager::Get().QueryModule(ModuleFName, ModuleStatus) [File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Editor/GameProjectGeneration/Private/GameProjectUtils.cpp] [Line: 4047]
LogOutputDevice: Error: Stack:
LogOutputDevice: Error: [Callstack] 0x00007ffaa4041719 UE4Editor-GameProjectGeneration.dll!<lambda_6132b019453403013bb878465d17e750>::operator()() [D:\Build++UE4+Licensee\Sync\Engine\Source\Editor\GameProjectGeneration\Private\GameProjectUtils.cpp:4047]
LogOutputDevice: Error: [Callstack] 0x00007ffaa3f27cc5 UE4Editor-GameProjectGeneration.dll!GameProjectUtils::AddCodeToProject_Internal() [D:\Build++UE4+Licensee\Sync\Engine\Source\Editor\GameProjectGeneration\Private\GameProjectUtils.cpp:4047]
LogOutputDevice: Error: [Callstack] 0x00007ffaa3f26173 UE4Editor-GameProjectGeneration.dll!GameProjectUtils::AddCodeToProject() [D:\Build++UE4+Licensee\Sync\Engine\Source\Editor\GameProjectGeneration\Private\GameProjectUtils.cpp:1306]
LogOutputDevice: Error: [Callstack] 0x00007ffaa3f7c861 UE4Editor-GameProjectGeneration.dll!SNewClassDialog::FinishClicked() [D:\Build++UE4+Licensee\Sync\Engine\Source\Editor\GameProjectGeneration\Private\SNewClassDialog.cpp:1249]
LogOutputDevice: Error: [Callstack] 0x00007ffaa3f759be UE4Editor-GameProjectGeneration.dll!TBaseSPMethodDelegateInstance<0,SNewClassDialog,0,void __cdecl(void)>::ExecuteIfSafe() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:374]
LogOutputDevice: Error: [Callstack] 0x00007ffab7b19249 UE4Editor-AppFramework.dll!SWizard::HandleFinishButtonClicked() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\AppFramework\Private\Widgets\Workflow\SWizard.cpp:305]
LogOutputDevice: Error: [Callstack] 0x00007ffab7adee57 UE4Editor-AppFramework.dll!TBaseSPMethodDelegateInstance<0,SWizard,0,FReply __cdecl(void)>::Execute() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:298]
LogOutputDevice: Error: [Callstack] 0x00007ffab99c207e UE4Editor-Slate.dll!SButton::ExecuteOnClick() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:385]
LogOutputDevice: Error: [Callstack] 0x00007ffab99db27e UE4Editor-Slate.dll!SButton::OnMouseButtonUp() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:304]
LogOutputDevice: Error: [Callstack] 0x00007ffab9822dc8 UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_cc5aea9e7377b04ce85c30c65ec3889b> >() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:372]
LogOutputDevice: Error: [Callstack] 0x00007ffab98a69cf UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4675]
LogOutputDevice: Error: [Callstack] 0x00007ffab988f4b2 UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5198]
LogOutputDevice: Error: [Callstack] 0x00007ffab9882392 UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5166]
LogOutputDevice: Error: [Callstack] 0x00007ffad6267f88 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2133]
LogOutputDevice: Error: [Callstack] 0x00007ffad6255c87 UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2585]
LogOutputDevice: Error: [Callstack] 0x00007ffad626a609 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1809]
LogOutputDevice: Error: [Callstack] 0x00007ffad62517d0 UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:852]
LogOutputDevice: Error: [Callstack] 0x00007ffb11465c1d USER32.dll!UnknownFunction ]
LogOutputDevice: Error: [Callstack] 0x00007ffb11465612 USER32.dll!UnknownFunction ]
LogOutputDevice: Error: [Callstack] 0x00007ffad626bb24 UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130]
LogOutputDevice: Error: [Callstack] 0x00007ff6ce0668c4 UE4Editor.exe!FEngineLoop::Tick() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4762]
LogOutputDevice: Error: [Callstack] 0x00007ff6ce07ba7c UE4Editor.exe!GuardedMain() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169]
LogOutputDevice: Error: [Callstack] 0x00007ff6ce07bb5a UE4Editor.exe!GuardedMainWrapper() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
LogOutputDevice: Error: [Callstack] 0x00007ff6ce08e31d UE4Editor.exe!WinMain() [D:\Build++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
LogOutputDevice: Error: [Callstack] 0x00007ff6ce09145a UE4Editor.exe!__scrt_common_main_seh() [d:\agent_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
LogOutputDevice: Error: [Callstack] 0x00007ffb113a7c24 KERNEL32.DLL!UnknownFunction ]
LogOutputDevice: Error: [Callstack] 0x00007ffb1334cea1 ntdll.dll!UnknownFunction ]
LogStats: SubmitErrorReport - 0.000 s
LogStats: SendNewReport - 3.059 s
LogStats: FDebug::EnsureFailed - 13.112 s
LogSlate: Window ‘Add C++ Class’ being destroyed[/SPOILER]