CryptographicException in BaseClient.Connect()

Using SSH.NET 2020.0.1, occasionally CryptographicException is thrown in call to BaseClient.Connect():

System.Security.Cryptography.CryptographicException: Hash not valid for use in specified state.
   at System.Security.Cryptography.CryptographicException.ThrowCryptographicException(Int32 hr)
   at System.Security.Cryptography.Utils.HashData(SafeHashHandle hHash, Byte[] data, Int32 cbData, Int32 ibStart, Int32 cbSize)
   at System.Security.Cryptography.SHA1CryptoServiceProvider.HashCore(Byte[] rgb, Int32 ibStart, Int32 cbSize)
   at System.Security.Cryptography.HashAlgorithm.ComputeHash(Byte[] buffer)
   at Renci.SshNet.Security.Cryptography.CipherDigitalSignature.Sign(Byte[] input)
   at Renci.SshNet.Security.KeyHostAlgorithm.Sign(Byte[] data)
   at Renci.SshNet.PrivateKeyAuthenticationMethod.Authenticate(Session session)
   at Renci.SshNet.ClientAuthentication.TryAuthenticate(ISession session, AuthenticationState authenticationState, String[] allowedAuthenticationMethods, SshAuthenticationException& authenticationException)
   at Renci.SshNet.ClientAuthentication.Authenticate(IConnectionInfoInternal connectionInfo, ISession session)
   at Renci.SshNet.ConnectionInfo.Authenticate(ISession session, IServiceFactory serviceFactory)
   at Renci.SshNet.Session.Connect()
   at Renci.SshNet.BaseClient.CreateAndConnectSession()
   at Renci.SshNet.BaseClient.Connect()

Will try to gather more info and report back.

Start at BaseClient.Connect() and follow the reported stack through PrivateKeyAuthenticationMethod.Authenticate, KeyHostAlgorithm.Sign, and CipherDigitalSignature.Sign. Reproduce the intermittent CryptographicException using SSH.NET 2020.0.1 and inspect the surrounding authentication and signing flow; done means the cause is identified and the connection no longer produces this exception.