  Dwarf galaxies in groups of galaxies provide excellent test cases for models
of structure formation. This led to a so-called small-scale crisis, including
the famous missing satellite and too-big-to-fail problems. It was suggested
that these two problems are solved by the introduction of baryonic physics in
cosmological simulations. We test for the nearby grand spiral M83 - a Milky Way
sibling - whether its number of dwarf galaxy companions is compatible with
today's $\Lambda$ + Cold Dark Matter model using two methods: with cosmological
simulations that include baryons, as well as with theoretical predictions from
the sub-halo mass function. By employing distance measurements we recover a
list of confirmed dwarf galaxies within 330 kpc around M83 down to a magnitude
of $M_V =-10$. We found that both the state-of-the-art hydrodynamical
cosmological simulation Illustris-TNG50 and theoretical predictions agree with
the number of confirmed satellites around M83 at the bright end of the
luminosity function (>10$^8$ solar masses) but underestimate it at the faint
end (down to 10$^6$ solar masses) at more than 3$\sigma$ and 5$\sigma$ levels,
respectively. This indicates a too-many satellites problem in $\Lambda$CDM for
M83. The actual degree of tension to cosmological models is underestimated,
because the number of observed satellites is incomplete due to the high
contamination of spurious stars and galactic cirrus.
