How to reproduce:
1. Open the user's attached project("GC_Mainline.zip").
2. Enter Play mode
3. In the Game View click "Craft Games"
4. Click "Click here to Craft New Games"
5. Open the Profiler and record a few frames
6. Analyse a frame

Expected results: The fallback allocator shows up only when the primary memory allocator is exhausted
Actual results: The fallback allocation starts at the very beginning of the frame and keeps happening during the frame

Reproducible with: 2020.1.14f1 (ECS 0.16.0-preview.21)
Could not test with: 2018.4.30f1, 2019.4.16f1, 2020.1.17f1, 2020.2.0b14, 2021.1.0a9 (Couldn't downgrade/upgrade, project is big, becomes erroneous)

Note: The user claims it also repros with 2020.2.0b12