Unreal Engine 4.21 Preview

When switching to mobile preview engine crashes to this assert. .com/EpicGames/UnrealEngine/blob/4.21/Engine/Source/Runtime/RenderCore/Public/UniformBuffer.h#L85
This is triggered by rendering reflection captures. .com/EpicGames/UnrealEngine/blob/4.21/Engine/Source/Runtime/Renderer/Private/MobileSceneCaptureRendering.cpp#L336
If I return from that function immediatly game wont crash anymore. Can anyone else reproduce this?