So got this error and some stuttering in game. I increase those 2 values to 1.000.000 ( from default 500.000) . And it fixed it. I am not 100% sure about the detail under the hood of this DX12 implementation thought.
Adding this to DefaultEngine.ini
[SystemSettings]
D3D12.LocalViewHeapSize=1000000
D3D12.GlobalViewHeapSize=1000000
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