diff --git a/release-notes/3.0/preview/3.0.0-preview-known-issues.md b/release-notes/3.0/preview/3.0.0-preview-known-issues.md
index a0ead572..163938fb 100644
--- a/release-notes/3.0/preview/3.0.0-preview-known-issues.md
+++ b/release-notes/3.0/preview/3.0.0-preview-known-issues.md
@@ -33,6 +33,14 @@ To update the path for every new terminal session, the `export` entry will need
 
 ## ASP.NET Core
 
+### Preview 8
+
+- **Starting a client or bi-directional streaming gRPC call with an already canceled `CallOptions.CancellationToken` will hang**
+
+   Starting a client or bi-directional streaming call with an already canceled `CallOptions.CancellationToken` will not properly cancel the call. Sending a message with `RequestStream.WriteAsync` will hang.
+   
+   To workaround this issue ensure that the `CancellationToken` passed to client or bi-directional streaming calls is only ever canceled after the call has started.
+
 ### Preview 7
 
 - **Incorrect launch URL for the Web API template**