  In twisted homobilayer transition metal dichalcogenides, intra- and
inter-layer valley excitons hybridize with the layer configurations spatially
varying in the moir\'e. The ground state valley excitons are trapped at two
high-symmetry points with opposite electric dipoles in a moir\'e supercell,
forming a honeycomb superlattice of nearest-neighbor dipolar attraction. We
find that the spatial texture of layer configuration results in a luminescence
anomaly of the moir\'e trapped excitons, where a tiny displacement by
interactions dramatically increases the brightness and changes polarization
from circular to linear. At full filling, radiative recombination predominantly
occurs at edges and vacancies of the exciton superlattice. The anomaly also
manifests in the cascaded emission of small clusters, producing chains of
polarization entangled photons. An interlayer bias can switch the superlattice
into a single-orbital triangular lattice with repulsive interactions only,
where the luminescence anomaly can be exploited to distinguish ordered states
and domain boundaries at fractional filling.
