Repro:
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Download attached project. Set Scene View Mode to "Baked Lightmap". From the Lighting Settings window, ensure Baked Global Illumination is enabled. Also ensure "Auto" is enabled or click the "Generate" button. Observe the texel density checkerboard overlays in the Scene view.

Noted:
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The imported cuboid and planes have notably different texel density between the imported UVs and those UVs generted by the Unity importer.

Expected:
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The texel density determined in the Lighting Settings tab should be consistent between objects regardless of whether these have been imported or generated in Unity. In the example project, the UVs are verified as being free of distortion, so this behaviour is unexpected.

Inconsistent texel densities could cause notable seam issues when juxtaposing geometry from different sources. We should be able to handle this.