Black gaps between static meshes in iOS build, what might be causing this?

Development Platform & Builds
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1

I finally managed to build my game for IOS (UE 5.3.1), and it runs fine on my 12.9" iPad. There is a weird rendering issue, though: Gaps show up between my static meshes. These aren’t visible on Windows, or my desktop Mac.

I’m a bit at a loss where even to start looking - is this a scalability issue? MobileContentScaleFactor? Float precision on mobile? Anti-aliasing artefact? Something Metal?

If anyone has any ideas what might be causing this, please let me know! Happy to provide more info. Thanks!

gaps-ios
gaps-ios925×943 58.9 KB

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Actually, these lines aren’t between meshes, they run right through them -not corresponding to anything in the mesh geometry. They seem to be all horizontal and vertical, unrelated to anything in the scene, as far as I can see.