In ΛCDM with parity symmetry and statistically isotropic, Gaussian initial conditions, correlations between temperature and B-mode polarization (TB) and between E- and B-mode polarization (EB) should vanish, so any detected non-zero TB/EB cross-power is usually interpreted as evidence for parity-violating physics, cosmic birefringence, or foreground/systematic contamination rather than standard early-universe dynamics (Lue et al. 1999; Kamionkowski & Kovetz 2016). Hints of TB/EB signals in CMB data, and robust TB/EB correlations in polarized Galactic dust emission, therefore pose a challenge: one must either push ΛCDM beyond its minimal assumptions with new fields or interactions, or attribute the observed parity-odd patterns to complex foreground geometry and instrument effects, both of which require additional structure beyond the simplest hot Big Bang plus inflation picture (Planck Collaboration XI 2016; Clark et al. 2021).