I found an option to edit individual vertexes without calling EditMesh().
#include "Util/DynamicVector.h"
UDynamicMesh* DynMesh2 = DynamicMeshComponent->GetDynamicMesh();
FDynamicMesh3* DynMesh3 = DynamicMeshComponent->GetMesh();
/* Прямое редактирование меша по ссылке на массив вертексов */
// Get vertexs by reference
UE::Geometry::TDynamicVector<FVector3d> Vert = DynMesh3->GetVerticesBuffer();
Vert[0] = FVector3d{ 0, 0, 222 };
Vert[1] = FVector3d{ 0, 0, 222 };
Vert[2] = FVector3d{ 0, 0, 222 };
DynMesh3->UpdateChangeStamps(true, false); // update mesh
// or
// DynamicMeshComponent->FastNotifyPositionsUpdated();