The IceCube Neutrino Observatory has detected a flux of high-energy astrophysical neutrinos (TeV to PeV energies) that appears largely isotropic, suggesting a predominantly extragalactic origin. However, recent analyses have hinted at a diffuse emission component along the Galactic plane (4.5-sigma), yet the observed spectral index and spatial distribution do not fully match expectations from cosmic ray interactions with the interstellar medium (hadronic production). Furthermore, the lack of identified bright point sources for the bulk of the high-energy flux creates a tension: if the neutrinos are extragalactic, they should be associated with known blazars or star-forming galaxies, but stacking analyses often recover only a fraction of the diffuse flux, implying either a population of "hidden" sources or a misunderstanding of the production mechanism (IceCube Collaboration 2023; Plaisier 2022).