REGRESSION Was not able to reproduce this in 4.24
Crash occurs when the user attempts to run a networking PIE session in a world containing an EQSTestingPawn actor.
I was not able to reproduce this in 4.26.
RESULT
Crash
Assertion failed: IsInGameThread() [File:D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Public\DebugRenderSceneProxy.h] [Line: 268] KERNELBASE.dll!UnknownFunction [] UE4Editor-Core.dll!ReportAssert() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsPlatformCrashContext.cpp:1537] UE4Editor-Core.dll!FWindowsErrorOutputDevice::Serialize() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsErrorOutputDevice.cpp:78] UE4Editor-Core.dll!FOutputDevice::LogfImpl() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\OutputDevice.cpp:61] UE4Editor-Core.dll!AssertFailedImplV() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:100] UE4Editor-Core.dll!FDebug::CheckVerifyFailedImpl() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:450] UE4Editor-AIModule.dll!UEQSRenderingComponent::CreateSceneProxy() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\AIModule\Private\EnvironmentQuery\EQSRenderingComponent.cpp:292] UE4Editor-Renderer.dll!FScene::AddPrimitive() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Renderer\Private\RendererScene.cpp:1291] UE4Editor-Engine.dll!<lambda_1c454102935558661824d22f5ad28ce6>::operator()() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Components\ActorComponent.cpp:92] UE4Editor-Engine.dll!ParallelForImpl::TParallelForData<TFunctionRef<void __cdecl(int)> >::Process() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Public\Async\ParallelFor.h:169] UE4Editor-Engine.dll!TGraphTask<ParallelForImpl::TParallelForTask<TFunctionRef<void __cdecl(int)> > >::ExecuteTask() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Public\Async\TaskGraphInterfaces.h:849] UE4Editor-Core.dll!FTaskThreadAnyThread::ProcessTasks() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:1039] UE4Editor-Core.dll!FTaskThreadAnyThread::ProcessTasksUntilQuit() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:863] UE4Editor-Core.dll!FTaskThreadAnyThread::Run() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:940] UE4Editor-Core.dll!FRunnableThreadWin::Run() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:86] UE4Editor-Core.dll!FRunnableThreadWin::GuardedRun() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:35] KERNEL32.DLL!UnknownFunction [] ntdll.dll!UnknownFunction []
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-94266 in the post.