Reproduction steps:
1. Open the project in "MappedAddress.zip" (60 KB)
2. Open SampleScene and enter Play Mode
3. Script in Pinger.cs will be executed (mapped address ping, code in the image below)
Unexpected behaviour: error is thrown in the console: "Ping address is IPv4 mapped to IPv6, but we do not handle mapped addresses.", the Ping never returns a result
Reproducible with: 2018.4.28f1, 2019.4.14f1, 2020.1.12f1, 2021.1.0a3
Tested macOS and iOS