  We discuss renormalization of chiral nuclear forces in the 3P0 channel of N N
scattering at next- to-next-to leading order (N2LO) if the one-pion exchange is
treated nonperturbatively at leading order. The matrix elements of the
subleading contact potentials become nearly dependent of each other for the
so-called exceptional ultraviolet momentum cutoff, making it difficult to
determine the strengths of those contact potentials from the empirical phase
shifts, as reported in Ref. [1]. We argue that this issue can be resolved by
adjusting the strategy by which the low-energy constants are deduced from the
data, thus making those exceptional cutoffs amenable to chiral effective field
theory.
