source/blender/editors/sculpt_paint/paint_mask.cc

@@ -749,6 +749,9 @@ static void face_set_gesture_apply_task_cb(void *__restrict userdata,
   PBVHFaceIter fd;
   BKE_pbvh_face_iter_begin (sgcontext->ss->pbvh, node, fd) {
     if (sculpt_gesture_is_face_effected(sgcontext, &fd)) {
+      if (sgcontext->ss->hide_poly && sgcontext->ss->hide_poly[fd.face.i]) {
+        continue;
+      }
       SCULPT_face_set_set(sgcontext->ss, fd.face, face_set_operation->new_face_set_id);
       any_updated = true;
     }