The issue is discussed in this UDN:

Key quote from UDN thread is:
"Also, having made a texture array with 190 entries, it seems to partially work in an Editor build but the closest mip (or mips) are black. In the distance the texture goes it's correct colour, with the texture layer being chosen based on voxel type."

The problem occurs on both DX11 and DX12 and is not specific to either RHI.

Steps to Reproduce

see repro from [Link Removed]

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-87063 in the post.

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ComponentUE - Rendering
Affects Versions4.24
Target Fix4.26
Fix Commit13540269
Main Commit14151001
Release Commit13540269
CreatedJan 20, 2020
ResolvedMay 25, 2020
UpdatedAug 20, 2020