grpc-js: Fix reuse of channel filter stack factory

Author: murgatroid99

packages/grpc-js/src/filter-stack.ts

@@ -88,6 +88,10 @@ export class FilterStackFactory implements FilterFactory<FilterStack> {
     this.factories.unshift(...filterFactories);
   }
 
+  clone(): FilterStackFactory {
+    return new FilterStackFactory(this.factories);
+  }
+
   createFilter(): FilterStack {
     return new FilterStack(
       this.factories.map((factory) => factory.createFilter())

packages/grpc-js/src/internal-channel.ts

@@ -439,7 +439,7 @@ export class InternalChannel {
       parentCall: parentCall,
     };
 
-    const call = new ResolvingCall(this, method, finalOptions, this.filterStackFactory, this.credentials._getCallCredentials(), getNextCallNumber());
+    const call = new ResolvingCall(this, method, finalOptions, this.filterStackFactory.clone(), this.credentials._getCallCredentials(), getNextCallNumber());
 
     if (this.channelzEnabled) {
       this.callTracker.addCallStarted();