We've changed the handling of errors in HLS.js and now immediately send an error event to Mux Data when a fatal error occurs. If you do not want to treat some fatal errors as fatal, you should provide an errorTranslator function to filter which errors are tracked or disable automaticErrorTracking and handle errors manually. Read the Release Notes for more information. You can also read more about specifying an error translator function or disabling automatic error tracking in our docs.