  The LHCb collaboration has recently performed a measurement of the production
rate of inclusive $B$ hadron production ($pp\to BX$) at both 7 and 13~TeV
centre-of-mass (CoM) energies. As part of this measurement, the ratio of these
two cross section measurements has been presented differentially in $B$ hadron
pseudorapidity within the range of $\eta_B \in [2.0,5.0]$. A large tension
($4\sigma$) is observed for the ratio measurement in the lower pseudorapidity
range of $\eta_B \in [2.0,3.0]$, where the data is observed to exceed
theoretical predictions, while consistency is found at larger $\eta_B$ values.
This behaviour is not expected within perturbative QCD, and can only be
achieved by introducing ad-hoc features into the structure of the
non-perturbative gluon PDF within the region of $x\in[10^{-3},10^{-4}]$.
Specifically, the gluon PDF must grow extremely quickly with decreasing $x$
within this kinematic range, closely followed by a period of decelerated
growth. However, such behaviour is highly disfavoured by global fits to proton
structure. Further studies of the available LHCb $B$ and $D$ hadron cross
section data, available for a range of CoM energies, indicate systematic
tension in the (pseudo)rapidity region of $[2.0,2.5]$.
