Texture Imports into UE5.3 seem to have broken textures when viewed from a shallow angle in Quest HMD

Development Asset Creation
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I recently upgraded my project to UE 5.3 and started to build for Quest headsets - since upgrading I have noticed that any texture imported has an odd artifact when viewed from the side in a Quest build - this doesn’t happen in any other build or in the editor - all the existing textures are fine - this only applies to newly imported ones.

When viewed from the side, all of these new textures appear bright magenta like the texture has not been found an is displaying a missing texture replacement colour.

magenta texture

Does anyone know a workaround for this? It looks like it’s missing the smallest mips or something like that.
Thanks,
Mark

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ps - another example - tree textures doing the same thing

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So after a lot of build cycles I may have found what the problem was - so for anyone getting magenta textures in their Quest build - this is what I found made the difference:

In Project Settings → Engine → Cooker → Textures : switch the ASTC Texture Compressor from Intel ISPC to Arm

So far the magenta textures have not re-appeared.