diff --git a/lucene/core/src/test/org/apache/lucene/search/BaseKnnVectorQueryTestCase.java b/lucene/core/src/test/org/apache/lucene/search/BaseKnnVectorQueryTestCase.java
index d45902d3bb3..fb4775712a0 100644
--- a/lucene/core/src/test/org/apache/lucene/search/BaseKnnVectorQueryTestCase.java
+++ b/lucene/core/src/test/org/apache/lucene/search/BaseKnnVectorQueryTestCase.java
@@ -281,12 +281,19 @@ abstract class BaseKnnVectorQueryTestCase extends LuceneTestCase {
 
       DocIdSetIterator it = scorer.iterator();
       assertEquals(3, it.cost());
-      assertEquals(2, it.nextDoc());
-      assertEquals(1 / 2f, scorer.score(), 0);
-      assertEquals(4, it.advance(4));
-      assertEquals(1 / 6f, scorer.score(), 0);
-
-      assertEquals(NO_MORE_DOCS, it.advance(5));
+      int firstDoc = it.nextDoc();
+      if (firstDoc == 1) {
+        assertEquals(1 / 6f, scorer.score(), 0);
+        assertEquals(3, it.advance(3));
+        assertEquals(1 / 2f, scorer.score(), 0);
+        assertEquals(NO_MORE_DOCS, it.advance(4));
+      } else {
+        assertEquals(2, firstDoc);
+        assertEquals(1 / 2f, scorer.score(), 0);
+        assertEquals(4, it.advance(4));
+        assertEquals(1 / 6f, scorer.score(), 0);
+        assertEquals(NO_MORE_DOCS, it.advance(5));
+      }
       expectThrows(ArrayIndexOutOfBoundsException.class, scorer::score);
     }
   }
@@ -384,7 +391,7 @@ abstract class BaseKnnVectorQueryTestCase extends LuceneTestCase {
         assertEquals(0, matched.getDetails().length);
         assertEquals("within top 3 docs", matched.getDescription());
 
-        Explanation nomatch = searcher.explain(query, 1);
+        Explanation nomatch = searcher.explain(query, 5);
         assertFalse(nomatch.isMatch());
         assertEquals(0f, nomatch.getValue());
         assertEquals(0, matched.getDetails().length);