  Lepton flavor universality can be tested through the ratio of semileptonic
$B$ meson decays and leptonic $\Upsilon$ meson decays, with $\Upsilon \equiv
\Upsilon(nS)$ ($n=1,2,3$). For the charged-current transitions $b \to
c\tau\bar{\nu}_\tau$, discrepancies between the experiment and the Standard
Model (SM) have been observed in recent years by different flavor facilities
such as BABAR, Belle, and LHCb. While for the neutral-current transitions $b
\bar{b} \to \tau\bar{\tau}$, the BABAR experiment reported recently a new
measurement of leptonic decay ratio $R_{\Upsilon(3S)} = {\rm BR}(\Upsilon(3S)
\to \tau^+\tau^-)/{\rm BR}(\Upsilon(3S) \to \mu^+\mu^-)$, showing an agreement
with the SM at the $1.8 \sigma$ level. In light of this new BABAR result and
regarding the connection between new physics (NP) interpretations to the
charged-current $b \to c \tau \bar{\nu}_{\tau}$ anomalies and neutral-current
$b \bar{b} \to \tau \bar{\tau}$ processes, in this study, we revisit the NP
consequences of this measurement within a simplified model with extra massive
gauge bosons that coupled predominantly to left-handed leptons of the
third-generation. We show that the BABAR measurement of $R_{\Upsilon(3S)}$
cannot easily be accommodated (within its experimental $1\sigma$ range)
together with the other $b \to c\tau\bar{\nu}_\tau$ data, hinting toward a new
anomalous observable.
