Steps to Reproduce

1. Setup custom delegate to ServicePointManager.ServerCertificateValidationCallback
2. Call any HTTPS server with the untrusted root certificate.

Current Behavior

chain parameter has empty "ChainElements" property

Expected Behavior

ChainElements should contain server sent a certificate chain. I see this behaviour for Btls provider and Windows .NET Framework.

On which platforms did you notice this

[x ] macOS
[ ] Linux
[ ] Windows

Version Used:
5.4.0.177