diff --git a/solr/core/src/java/org/apache/solr/handler/ReplicationHandler.java b/solr/core/src/java/org/apache/solr/handler/ReplicationHandler.java
index 3196641a0f6..40943072223 100644
--- a/solr/core/src/java/org/apache/solr/handler/ReplicationHandler.java
+++ b/solr/core/src/java/org/apache/solr/handler/ReplicationHandler.java
@@ -341,8 +341,8 @@ public void handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp) throw
         reportErrorOnResponse(rsp, "No follower configured", null);
       }
     } else if (command.equals(CMD_SHOW_COMMITS)) {
-      final CoreReplication coreReplicationAPI = new CoreReplication(core, req, rsp);
-      V2ApiUtils.squashIntoSolrResponseWithoutHeader(rsp, coreReplicationAPI.fetchCommits());
+      rsp.add(CMD_SHOW_COMMITS, getCommits());
+      rsp.add(STATUS, OK_STATUS);
     } else if (command.equals(CMD_DETAILS)) {
       final CoreReplication coreReplicationAPI = new CoreReplication(core, req, rsp);
       // stringifyBooleans=true: V1's command=details has always rendered isLeader/isFollower/etc.
@@ -352,6 +352,10 @@ public void handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp) throw
           coreReplicationAPI.fetchReplicationDetails(solrParams.getBool("follower", true)),
           true,
           true);
+      // V1 has rendered commits as NamedList (flatmap), not a map
+      @SuppressWarnings("unchecked")
+      final var details = (NamedList<Object>) rsp.getValues().get(CMD_DETAILS);
+      details.setVal(details.indexOf(CMD_SHOW_COMMITS, 0), getCommits());
     } else if (CMD_ENABLE_REPL.equalsIgnoreCase(command)) {
       setReplicationEnabled(true);
       rsp.add(STATUS, OK_STATUS);
diff --git a/solr/core/src/test/org/apache/solr/handler/ReplicationCommitsV1ResponseTest.java b/solr/core/src/test/org/apache/solr/handler/ReplicationCommitsV1ResponseTest.java
new file mode 100644
index 00000000000..8b32aa27310
--- /dev/null
+++ b/solr/core/src/test/org/apache/solr/handler/ReplicationCommitsV1ResponseTest.java
@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.solr.handler;
+
+import java.util.List;
+import java.util.Map;
+import org.apache.solr.SolrTestCaseJ4;
+import org.apache.solr.common.util.Utils;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class ReplicationCommitsV1ResponseTest extends SolrTestCaseJ4 {
+
+  @BeforeClass
+  public static void beforeClass() throws Exception {
+    initCore("solrconfig-leader1.xml", "schema.xml");
+  }
+
+  @Test
+  public void testV1CommitsFlatNamedListShape() throws Exception {
+    assertU(adoc("id", "1"));
+    assertU(commit());
+
+    String json =
+        h.query("/replication", req("command", "commits", "wt", "json", "json.nl", "flat"));
+    assertFirstCommitIsFlatNamedList(json);
+  }
+
+  @Test
+  public void testV1CommitsDefaultJsonShape() throws Exception {
+    assertU(adoc("id", "1"));
+    assertU(commit());
+
+    String json = h.query("/replication", req("command", "commits", "wt", "json"));
+    assertFirstCommitIsFlatNamedList(json);
+  }
+
+  private static void assertFirstCommitIsFlatNamedList(String json) {
+    List<?> commits = (List<?>) ((Map<?, ?>) Utils.fromJSONString(json)).get("commits");
+    assertFalse("expected at least one commit point", commits.isEmpty());
+    Object firstCommit = commits.get(0);
+    assertTrue(
+        "v1 commits entry must stay a NamedList rendered as a flat name/value array, got: "
+            + firstCommit,
+        firstCommit instanceof List);
+    List<?> entry = (List<?>) firstCommit;
+    assertEquals("indexVersion", entry.get(0));
+    assertEquals("generation", entry.get(2));
+  }
+}