has Refreshable Session
Whether re-bootstrapping can ever change an auth rejection's outcome — i.e. the provider derives fresh session state from server responses (Google's session=, Cesium Ion's per-asset token). Gates TileFetchQueue's session recovery: for static-credential providers (custom headers, bearer token) a 401/403 is final, and recovery would loop refetch-root → reject → recover forever. Default false; only providers with a meaningful invalidateSessionState should return true.