How to reproduce:
1. Open "reflectiontest" from the attached project
2. Deselect any object
3. Start Play mode

Expected result: The cube should be visible in the reflection on the sphere

Actual result: The cube is not visible in the reflection until a 3D object is selected.

Reproducible with: 2019.3.0f1(HDRP 7.1.5), 2019.3.0f4(HDRP 7.1.7), 2020.1.0a11(HDRP 7.1.5), 2020.1.0a18 (HDRP 7.1.7)
Not reproducible with: 2018.4.15f1(HDRP 4.10.0), 2019.2.17f1(HDRP 6.9.2), 2019.3.0b12 (HDRP 7.1.5), 2020.1.0a9 (HDRP 7.1.2)
Could not test with: 2017.4.36f1 - HDRP not supported, 2020.1.0a9 (HDRP 7.1.5 - 7.1.7) - package compilation errors

Notes:
1. Only reproducible with HDRP pipeline.
2. The probe starts updating whenever a Material is shown in Inspector by having Material asset or some Renderer selected.
3. It is also possible to reproduce the issue manually, by adding a new reflection probe in the scene and setting it to realtime + every frame.
4. ❗ In standalone player, this makes it impossible to have the probe rendered ❗
5. Adding those lines to the start function of the script didn't help:
var hdProbe = probeGameObject.AddComponent<UnityEngine.Rendering.HighDefinition.HDAdditionalReflectionData>();
hdProbe.mode = ProbeSettings.Mode.Realtime;
hdProbe.realtimeMode = ProbeSettings.RealtimeMode.EveryFrame;
hdProbe.RequestRenderNextUpdate();