Reproduction steps:
1. Open "NetworkTest.zip" project
2. Build Server for Android
3. Uncomment line 1 in "TestScript.cs" script
4. Build Client for Android
5. Install Server and Client on different devices
6. Start both applications at the same time
7. In the Server press the button (Initialized (server))
8. In the Client press the button (Initialized (client))

Expected Result: A button appears with text "Game at ::ffff::*IP*"
Actual Result: No button appears

Reproduced with: 2020.1.0a3, 2019.3.0b2, 2019.2.5f1, 2019.1.0f2, 2018.4.8f1
Could not reproduce on: 2017.4.32f1 (builds fail)

Repro Devices:
VLNQA00015, Samsung Galaxy Note8 (SM-N950W), Android 8.0.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00224, Samsung Galaxy A5(2017) (SM-A520F), Android 8.0.0, CPU: Exynos 7 Octa 7880, GPU: Mali-T830
VLNQA00123, Google Pixel 2 XL (Pixel 2 XL), Android 9, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00272, Samsung Galaxy S10+ (SM-G975U), Android 9, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00262, Sony Xperia XZ Premium (G8141), Android 9, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
N/A, Xiaomi Mi 5 (MI 5), Android 6.0.1, CPU: Snapdragon 820 MSM8996, GPU: Adreno (TM) 530
VLNQA00098, Lge LG G4 (LG-H815), Android 6.0, CPU: Snapdragon 808 MSM8992, GPU: Adreno (TM) 418
VLNQA00020, Samsung Galaxy S3 (SGH-T999), Android 4.3, CPU: Snapdragon S4 Plus MSM8960, GPU: Adreno (TM) 225