These taxa were previously lumped in acknowledgement of phylogenetic review of brown bears in eastern Asia, which show they form a unified clade with Alaskan brown bears (Hirata et al. 2013). This reflects what has been increasingly understood among Beringian immigrations into North America, as exhibited amongst over carnivorans species, big and small (Colella et al. 2021, Puckett et al. 2015, Reding et al. 2021, Sacks et al. 2018). However, there have not been formal revisions that unify these taxa as one - just the acknowledgement that they form a distinct clade. These are taxa that are still written about in current research and literature; until a formal amendment is conducted, they should probably be maintained as distinct on iNaturalist.
Don E. Wilson and DeeAnn M. Reeder (editors). 2005. Mammal Species of the World. A Taxonomic and Geographic Reference (3rd ed), Johns Hopkins University Press, 2,142 pp. (Link)
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.