A large number of failed to copy from GICache errors appear in the console towards the end of baking

Steps to reproduce
- Import the project https://tinyurl.com/yahxwh5a
- Open ExtUsgA01 scene (Assets > _Project > Scenes > 03ExtensiveUsage)
- In the Hierarchy panel, select the Terrain gameobject
- Once the Terrain gameobject has been selected, navigate to the Terrain Settings in the Inspector panel
- In the Terrain & Detail Objects section, make sure that Bake Light Probes for Trees, and Remove Light Probe Ringing are enabled
- Navigate to the Lighting panel (Window > Rendering > Lighting Settings)
- Bake using the Enlighten light mapper
Notice issue >>Towards the end of the bake lots of errors appear in the console.

From test case: https://tinyurl.com/ybrkwwt4
Log EnlightenErrors.log attached

Working OSX 2018.3.0b10, 2018.3.0a1
Broken Windows: 2018.3.0b12, 2018.3.0b10, 2018.3.0b7 (vague errors)
Feature not included in 2018.2.8f1
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On Mac a different error was observed with the same project, steps on Unity version 2018.3.0f1 (Screenshot has been attached for reference).

Stack Trace: 'Create ProbeSet' job failed with error code: 3 ('Failed loading Probe Set Positions file.').