diff --git a/test/e2e/cli/config.go b/test/e2e/cli/config.go
index 84aea6e9..689b51a9 100644
--- a/test/e2e/cli/config.go
+++ b/test/e2e/cli/config.go
@@ -38,6 +38,8 @@ type Command struct {
 	Yaml bool `yaml:"yaml,omitempty"`
 	// IgnoreWhitespace indicates that whitespace differences should be ignored in the output
 	IgnoreWhitespace bool `yaml:"ignoreWhitespace,omitempty"`
+	// StdErrTabToWhitespace replaces "\t" (tab) character with whitespace "  "
+	StdErrTabToWhitespace bool `yaml:"stdErrTabToWhitespace,omitempty"`
 }
 
 type TestCaseConfig struct {
diff --git a/test/e2e/cli/suite.go b/test/e2e/cli/suite.go
index 0960f55b..380320ee 100644
--- a/test/e2e/cli/suite.go
+++ b/test/e2e/cli/suite.go
@@ -148,6 +148,10 @@ func (s *CliTestSuite) RunTestCase(t *testing.T, tc TestCaseConfig) {
 			command.Stdout = strings.ReplaceAll(command.Stdout, search, replace)
 			command.Stderr = strings.ReplaceAll(command.Stderr, search, replace)
 		}
+				
+		if command.StdErrTabToWhitespace {
+			stderrStr = strings.ReplaceAll(stderrStr, "\t", "  ") // Replace tabs with spaces
+		}
 
 		if command.IgnoreWhitespace {
 			command.Stdout = normalizeWhitespace(command.Stdout)
diff --git a/test/e2e/cli/testdata/rpkg-push/config.yaml b/test/e2e/cli/testdata/rpkg-push/config.yaml
index 16f94c84..1fc7fe99 100644
--- a/test/e2e/cli/testdata/rpkg-push/config.yaml
+++ b/test/e2e/cli/testdata/rpkg-push/config.yaml
@@ -188,3 +188,82 @@ commands:
           name: kptfile.kpt.dev
       kind: ResourceList
     yaml: true
+  - args:
+      - porchctl
+      - rpkg
+      - push
+      - --namespace=rpkg-push
+      - git-efe3d01c68dfdcdd69114c9a7c65cce0d662a46f
+    stdin: |
+      apiVersion: config.kubernetes.io/v1
+      items:
+      - apiVersion: ""
+        kind: KptRevisionMetadata
+        metadata:
+          annotations:
+            config.kubernetes.io/index: "0"
+            config.kubernetes.io/path: .KptRevisionMetadata
+            internal.config.kubernetes.io/index: "0"
+            internal.config.kubernetes.io/path: .KptRevisionMetadata
+          name: git-efe3d01c68dfdcdd69114c9a7c65cce0d662a46f
+          namespace: rpkg-push
+          uid: 8d61685e-584c-5b89-bd30-a8d8dccb13f9
+          resourceVersion: "1"
+      - apiVersion: kpt.dev/v1
+        info:
+          description: Updated Test Package Description
+        kind: Kptfile
+        metadata:
+          annotations:
+            config.kubernetes.io/index: "0"
+            config.kubernetes.io/local-config: "true"
+            config.kubernetes.io/path: Kptfile
+            internal.config.kubernetes.io/index: "0"
+            internal.config.kubernetes.io/path: Kptfile
+          name: test-package
+      - apiVersion: v1
+        data:
+          name: example
+        kind: ConfigMap
+        metadata:
+          annotations:
+            config.kubernetes.io/index: "0"
+            config.kubernetes.io/local-config: "true"
+            config.kubernetes.io/path: package-context.yaml
+            internal.config.kubernetes.io/index: "0"
+            internal.config.kubernetes.io/path: package-context.yaml
+          name: kptfile.kpt.dev
+      kind: ResourceList
+    stderr: |
+      Error: Internal error occurred: Operation cannot be fulfilled on packagerevisionresources.porch.kpt.dev "git-efe3d01c68dfdcdd69114c9a7c65cce0d662a46f": the object has been modified; please apply your changes to the latest version and try again 
+    exitCode: 1
+    yaml: true
+  - args:
+      - porchctl
+      - rpkg
+      - pull
+      - --namespace=rpkg-push
+      - git-efe3d01c68dfdcdd69114c9a7c65cce0d662a46f
+      - /tmp/porch-e2e/testing-invalid-render
+  - args:
+    - sh
+    - -c
+    - |
+      echo "pipeline:\n  mutators:\n  - image: gcr.io/kpt-fn/set-namespace:v0.4.0\n    configMap:\n      namespace: example-ns\n  - image: gcr.io/kpt-fn/set-annotations:v0.1.4\n" >> /tmp/porch-e2e/testing-invalid-render/Kptfile
+  - args:
+      - porchctl
+      - rpkg
+      - push
+      - --namespace=rpkg-push
+      - git-efe3d01c68dfdcdd69114c9a7c65cce0d662a46f
+      - /tmp/porch-e2e/testing-invalid-render
+    stderr: |
+      Error: Internal error occurred: fn.render: pkg /:
+        pkg.render:
+        pipeline.run: func eval "gcr.io/kpt-fn/set-annotations:v0.1.4" failed: rpc error: code = Internal desc = Failed to execute function "gcr.io/kpt-fn/set-annotations:v0.1.4": exit status 1 ([error] : failed to configure function: `functionConfig` must be a `ConfigMap` or `SetAnnotations`)
+
+      Error occurred rendering package in kpt function pipeline.
+      Package has NOT been pushed to remote.
+      Please fix package locally (modify until 'kpt fn render' succeeds) and retry. 
+    stdErrTabToWhitespace: true
+    exitCode: 1