  We revisit the Harder-Narasimhan stratification on a minuscule $p$-adic flag
variety, by the theory of modifications of $G$-bundles on the Fargues-Fontaine
curve. We compare the Harder-Narasimhan strata with the Newton strata
introduced by Caraiani-Scholze. As a consequence, we get further equivalent
conditions in terms of $p$-adic Hodge-Tate period domains for fully
Hodge-Newton decomposable pairs. Moreover, we generalize these results to
arbitrary cocharacters case by considering the associated $B_{dR}^+$-affine
Schubert varieties. Applying Hodge-Tate period maps, our constructions give
applications to $p$-adic geometry of Shimura varieties and their local
analogues.
