gistfile1.diff

diff --git a/src/dm/impls/plex/plexrefine.c b/src/dm/impls/plex/plexrefine.c
index c6acb18..5667f07 100644
--- a/src/dm/impls/plex/plexrefine.c
+++ b/src/dm/impls/plex/plexrefine.c
@@ -6139,6 +6139,12 @@ static PetscErrorCode CellRefinerCreateLabels(CellRefiner
       ierr = DMLabelGetStratumIS(label, values[val], &pointIS);CHKERRQ(ierr);
       ierr = ISGetLocalSize(pointIS, &numPoints);CHKERRQ(ierr);
       ierr = ISGetIndices(pointIS, &points);CHKERRQ(ierr);
+      /* Ensure refined label is created with same number of strata as
+       * original (even if no entries here). */
+      if (!numPoints) {
+        ierr = DMLabelSetValue(labelNew, 0, values[val]);CHKERRQ(ierr);
+        ierr = DMLabelClearValue(labelNew, 0, values[val]);CHKERRQ(ierr);
+      }
       for (n = 0; n < numPoints; ++n) {
         const PetscInt p = points[n];
         switch (refiner) {