We provide the reader with a (very) short review of recent advances
in our understanding of the $\pi$-dependent terms in massless
(Euclidean) 2-point functions as well as in generic
anomalous dimensions and $\beta$-functions. We extend the considerations of \cite{Baikov:2018wgs} by one more loop, that is for the case of 6-loop correlators and 7-loop renormalization group (RG) functions