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.
There are certainly some who think these are separate taxa, e.g. treated at the species level by Michigan Flora (https://michiganflora.net/genus.aspx?id=Panicum), Flora Novae-Angliae (https://gobotany.nativeplanttrust.org/genus/panicum/; Haines 2011). In southern Ontario where both occur fairly commonly, they appear quite distinct ecologically and morphologically.