  Black hole low mass X-ray binaries in their hard spectral state are found to
display two different correlations between the radio emission from the compact
jets and the X-ray emission from the inner accretion flow. Here, we present a
large data set of quasi-simultaneous radio and X-ray observations of the
recently discovered accreting black hole MAXI J1348-630 during its 2019/2020
outburst. Our results span almost six orders of magnitude in X-ray luminosity,
allowing us to probe the accretion-ejection coupling from the brightest to the
faintest phases of the outburst. We find that MAXI J1348-630 belongs to the
growing population of outliers at the highest observed luminosities.
Interestingly, MAXI J1348-630 deviates from the outlier track at $L_{\rm X}
\lesssim 7 \times 10^{35} (D / 2.2 \ {\rm kpc})^2$ erg s$^{-1}$ and ultimately
rejoins the standard track at $L_{\rm X} \simeq 10^{33} (D / 2.2 \ {\rm
kpc})^2$ erg s$^{-1}$, displaying a hybrid radio/X-ray correlation, observed
only in a handful of sources. However, for MAXI J1348-630 these transitions
happen at luminosities much lower than what observed for similar sources (at
least an order of magnitude). We discuss the behaviour of MAXI J1348-630 in
light of the currently proposed scenarios and we highlight the importance of
future deep monitorings of hybrid correlation sources, especially close to the
transitions and in the low luminosity regime.
