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Later among the works it cites.
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2022

Internal boundaries of the loop amplituhedron

Dian, Gabriele, Heslop, Paul, Stewart, Alastair

Understand

The strict definition of positive geometry implies that all maximal residues of its canonical form are $\pm 1$.

We observe, however, that the loop integrand of the amplitude in planar $\mathcal{N}=4$ super Yang-Mills has maximal residues not equal to $\pm 1$.
We find the reason for this is that deep in the boundary structure of the loop amplituhedron there are geometries which contain internal boundaries: codimension one defects separating two regions of opposite orientation.
This phenomenon requires a generalisation of the concept of positive geometry and canonical form to include such internal boundaries and also suggests the utility of a further generalisation to `weighted positive geometries'.