File Attachment gives error in private endpoint enabled bot

[SyedFayaz]

Version

4.12.0

Bot Composer Versions:

Version: 2.1.3-nightly.364675.1a93f21
Electron: 14.2.6
Chrome: 93.0.4577.82
NodeJS: 14.17.0
V8: 9.3.345.20-electron.0

Describe the bug

Getting below error in bot when attachment is uploaded
Error getting value from 'ReadTimeout' on 'System.IO.MemoryStream'

To Reproduce

Steps to reproduce the behavior:

1. Make sure private endpoint is enabled in Bot Service
2. Add file attachment dialogs
3. Run the webchat sample code with createDirectLineAppServiceExtension
4. Upload any file - You will see Error getting value from 'ReadTimeout' on 'System.IO.MemoryStream'

Expected behavior

File should be attached successfully

Screenshots

Additional Error

Getting below error in Azure App Service Logs kudu logs

[OnTurnError] unhandled error : Error getting value from 'ReadTimeout' on 'System.IO.MemoryStream'.

Exception:
Newtonsoft.Json.JsonSerializationException: Error getting value from 'ReadTimeout' on 'System.IO.MemoryStream'.
---> System.InvalidOperationException: Timeouts are not supported on this stream.
at System.IO.Stream.get_ReadTimeout()
at lambda_method(Closure , Object )
at Newtonsoft.Json.Serialization.ExpressionValueProvider.GetValue(Object target)
--- End of inner exception stack trace ---
at Newtonsoft.Json.Serialization.ExpressionValueProvider.GetValue(Object target)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CalculatePropertyValues(JsonWriter writer, Object value, JsonContainerContract contract, JsonProperty member, JsonProperty property, JsonContract& memberContract, Object& memberValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer, IEnumerable values, JsonArrayContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)
at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)
at Newtonsoft.Json.JsonConvert.SerializeObjectInternal(Object value, Type type, JsonSerializer jsonSerializer)
at Microsoft.Bot.Builder.Dialogs.ObjectPath.GetNormalizedValue(Object value, Boolean json)
at Microsoft.Bot.Builder.Dialogs.ObjectPath.SetObjectSegment(Object obj, Object segment, Object value, Boolean json)
at Microsoft.Bot.Builder.Dialogs.ObjectPath.SetPathValue(Object obj, String path, Object value, Boolean json)
at Microsoft.Bot.Builder.Dialogs.DialogSet.CreateContextAsync(ITurnContext turnContext, CancellationToken cancellationToken)
at Microsoft.Bot.Builder.Dialogs.DialogExtensions.RunAsync(Dialog dialog, ITurnContext turnContext, IStatePropertyAccessor`1 accessor, CancellationToken cancellationToken)
at Microsoft.Bot.Builder.Dialogs.Adaptive.AdaptiveDialogBot.OnTurnAsync(ITurnContext turnContext, CancellationToken cancellationToken)
at Microsoft.Bot.Builder.SetSpeakMiddleware.OnTurnAsync(ITurnContext turnContext, NextDelegate next, CancellationToken cancellationToken)
at Microsoft.Bot.Builder.ShowTypingMiddleware.OnTurnAsync(ITurnContext turnContext, NextDelegate next, CancellationToken cancellationToken)
at Microsoft.Bot.Builder.MiddlewareSet.ReceiveActivityWithStatusAsync(ITurnContext turnContext, BotCallbackHandler callback, CancellationToken cancellationToken)
at Microsoft.Bot.Builder.BotAdapter.RunPipelineAsync(ITurnContext turnContext, BotCallbackHandler callback, CancellationToken cancellationToken)
Failed to read frame from transport.

Exception:
System.IO.InvalidDataException: header type delimeter is malformed
at Microsoft.Bot.Streaming.Payloads.HeaderSerializer.Deserialize(Byte[] buffer, Int32 offset, Int32 count)
at Microsoft.Bot.Connector.Streaming.Transport.TransportHandler.TryParseHeader(ReadOnlySequence`1& buffer, Header& header)
at Microsoft.Bot.Connector.Streaming.Transport.TransportHandler.ListenAsync(CancellationToken cancellationToken)