Fix possible corner case in revalidation (#5172)

* remove all from members

* add test

substrate/client/transaction-pool/src/revalidation.rs

@@ -151,7 +151,6 @@ impl<Api: ChainApi> RevalidationWorker<Api> {
 				} else {
 					for xt in &to_queue {
 						extrinsics.remove(xt);
-						self.members.remove(xt);
 					}
 				}
 				left -= to_queue.len();
@@ -163,6 +162,10 @@ impl<Api: ChainApi> RevalidationWorker<Api> {
 			}
 		}
 
+		for hash in queued_exts.iter() {
+			self.members.remove(hash);
+		}
+
 		queued_exts
 	}