To reproduce:
1. Open attached project
2. Build and run to android device
3. In application change the level from 1 to 2
4. Press load the level

Actual result: The banner ad is not showing up
Expected result: The banner ad should be visible instantly after loading

Reproduced with: 2019.2.18f1; 2020.1.0a19
Can not open the project on 2017.4- crashing; 2018.4 errors.

Tested and reproduced with:
VLNQA00099, Google Pixel XL (Pixel XL), Android 9, CPU: Snapdragon 821 MSM8996 Pro, GPU: Adreno (TM) 530
VLNQA00121, Samsung Galaxy S9 (SM-G960F), Android 9, CPU: Exynos 9 Series 9810, GPU: Mali-G72
VLNQA00285, Samsung Galaxy J4 Core (SM-J410F), Android 8.1.0, CPU: NOT FOUND, GPU: Adreno (TM) 308
VLNQA00290, Samsung Galaxy S10 5G (SM-G977U), Android 9, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00110, Samsung Galaxy Note2 (GT-N7100), Android 4.4.2, CPU: Exynos 4 Quad 4412, GPU: Mali-400 MP

Note: works on the editor
Can not check on standalone due to TLS Allocator ALLOC_TEMP_THREAD, underlying allocator ALLOC_TEMP_THREAD has unfreed allocations, size 33
Not reproducible with iPhone XR (iOS 12.0)
Logcat attached
Does not reproduce with 3.1.1 Ads package