How to reproduce:
1. Open attached project "case_1115306-ReflectionProbeStreamingBug_modified" and scene "SampleScene"
2. Make sure that Texture Streaming is enabled under Project Setting -> Quality
3. Build project with Compression Mode set to "Default" in the Build Settings
4. Run the built project and observe the sphere's reflections

Expected result: reflection resolution is high (can clearly see the skybox's reflection)
Actual result: reflection resolution is very low

Reproducible with: 2018.2.0a3, 2018.2.20f1, 2018.3.3f1, 2019.1.0b1, 2019.2.0a3
Could not test with: 2018.2.0a2 and older (no texture streaming feature)

Note: this happens only with baked reflection probes and only in build versions of the project