Blinking after adding a standard material

In the following PG, floor1 is flickering after adding a standard material, this is present in version 4, 5 and 6. Is it related to serialization?How to fix flickering?

It looks like z-fighting.

You should try to open your model in a DCC tool and see if you can spot coplanar triangles. If you generated the serialization from an existing PG, then it would help to see what this PG is doing.

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The model can be correctly rendered with pbr material.

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In fact the problem is really z-fighting. Your material has backface culling disabled, so there’s z-fighting between the font and back faces.

You will get the same problem in your PG with the PBR material if you disable backface culling: