Not Found Error: Failed to find existing task

[amankrx]

We get this intermittent error occasionally:

(Exit 34): NOT_FOUND: status: NotFound, message: "Failed to find existing task", details: [], metadata: MetadataMap { headers: {} } : Failed on wait_execution() command
java.io.IOException: io.grpc.StatusRuntimeException: NOT_FOUND: status: NotFound, message: "Failed to find existing task", details: [], metadata: MetadataMap { headers: {} } : Failed on wait_execution() command

This cancels the build altogether, but this succeeds upon retry. This is most likely a gRPC error and we should be able to handle this issue by timeout or retry internally instead of cancelling the build.