Coral-billed Scimitar-Babbler is split into two species based on distinct plumage differences and differences in vocalisations (Rasmussen and Anderton 2012, del Hoyo and Collar 2016). The monotypic group Coral-billed Scimitar-Babbler (Black-crowned) Pomatorhinus ferruginosus ferruginosus becomes Black-crowned Scimitar-Babbler Pomatorhinus ferruginosus; the second species is a polytypic Brown-crowned Scimitar-Babbler Pomatorhinus phayrei.
Unintended disagreements occur when a parent (B) is
thinned by swapping a child (E) to another part of the
taxonomic tree, resulting in existing IDs of the parent being interpreted
as disagreements with existing IDs of the swapped child.
Identification
ID 2 of taxon E will be an unintended disagreement with ID 1 of taxon B after the taxon swap
If thinning a parent results in more than 10 unintended disagreements, you
should split the parent after swapping the child to replace existing IDs
of the parent (B) with IDs that don't disagree.