diff --git a/templates/test/dev/cluster-template-custom-builds-load.yaml b/templates/test/dev/cluster-template-custom-builds-load.yaml
index b2b0b302908..1f52650dcee 100644
--- a/templates/test/dev/cluster-template-custom-builds-load.yaml
+++ b/templates/test/dev/cluster-template-custom-builds-load.yaml
@@ -230,6 +230,9 @@ spec:
           sku: ubuntu-2204-gen1
           version: latest
       osDisk:
+        cachingType: ReadOnly
+        diffDiskSettings:
+          option: Local
         diskSizeGB: 128
         osType: Linux
       sshPublicKey: ${AZURE_SSH_PUBLIC_KEY_B64:=""}
@@ -279,6 +282,9 @@ spec:
           sku: ubuntu-2204-gen1
           version: latest
       osDisk:
+        cachingType: ReadOnly
+        diffDiskSettings:
+          option: Local
         diskSizeGB: 128
         osType: Linux
       sshPublicKey: ${AZURE_SSH_PUBLIC_KEY_B64:=""}
diff --git a/templates/test/dev/custom-builds-load/kustomization.yaml b/templates/test/dev/custom-builds-load/kustomization.yaml
index ae9cf29326f..ef7a1f09463 100644
--- a/templates/test/dev/custom-builds-load/kustomization.yaml
+++ b/templates/test/dev/custom-builds-load/kustomization.yaml
@@ -8,6 +8,18 @@ patches:
 - path: patches/cluster-label-storageclass.yaml
 - path: patches/cluster-label-azuredisk.yaml
 - path: patches/kcp-scheduler.yaml
+- path: patches/ephemeral.yaml
+  target:
+    group: infrastructure.cluster.x-k8s.io
+    kind: AzureMachineTemplate
+    name: .*-md-0
+    version: v1beta1
+- path: patches/ephemeral.yaml
+  target:
+    group: infrastructure.cluster.x-k8s.io
+    kind: AzureMachineTemplate
+    name: .*-control-plane
+    version: v1beta1
 configMapGenerator:
 - files:
   - storageclass=../../../addons/storageclass-azure-disk.yaml