Engine crash on play, sometimes on loading map, in 4.17 after updating from 4.16

I’m getting this error after updating to 4.17 from 4.16 and loading into my map or pressing play. it’s random.

I’ve tried taking out the affected UASSETS and replacing them but nothing seems to fix it.

Assertion failed:
!HasAnyFlags(RF_NeedLoad|RF_NeedPostLoad)
[File:D:\Build++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectLinker.cpp]
[Line: 105] Detaching from existing
linker for
…/…/…/…/…/…/Users/micke/Perforce/Mickemoose_DEREK-LAPPY_838/WPBUE4/Content/DaxterStateMachine.uasset
while object PaperZDAnimTrack
/Game/DaxterStateMachine.Default__DaxterStateMachine_C:PaperZDAnimTrack_52
needs loaded

UE4Editor_Core!FDebug::AssertFailed()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:349]
UE4Editor_CoreUObject!UObject::SetLinker()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectlinker.cpp:105]
UE4Editor_CoreUObject!FLinkerLoad::Detach()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4328]
UE4Editor_CoreUObject!FLinkerManager::ResetLoaders()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkermanager.cpp:141]
UE4Editor_CoreUObject!UObject::Rename()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:213]
UE4Editor_Engine!UWorld::RenameToPIEWorld()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\engine\private\world.cpp:2519]
UE4Editor_Engine!UEngine::LoadMap()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\engine\private\unrealengine.cpp:10270]
UE4Editor_Engine!UEngine::Browse()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\engine\private\unrealengine.cpp:9685]
UE4Editor_Engine!UEngine::TickWorldTravel()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\engine\private\unrealengine.cpp:9874]
UE4Editor_UnrealEd!UEditorEngine::Tick()
[d:\build++ue4+release-4.17+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:1596]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick()
[d:\build++ue4+release-4.17+compile\sync\engine\source\editor\unrealed\private\unrealedengine.cpp:402]
UE4Editor!FEngineLoop::Tick()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3215]
UE4Editor!GuardedMain()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain()
[d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh()
[f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
kernel32