Screen Traces Off Causes Tiny Gap Between Static Meshes

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I’ve narrowed down the tiny gap where two static meshes overalp issue to Screen Traces under Lumen Reflections in Post Post Volume. The first image is Screen Traces OFF, the 2nd is Screen Traces ON.

Is there a way to eliminate the gap artifact without turning Screen Traces on?

All hardware ray tracing features are enabled, including Hit Lighting for GI.