diff --git a/src/components/comment-content/__tests__/comment-content.test.tsx b/src/components/comment-content/__tests__/comment-content.test.tsx
index 8217724b..dde686b7 100644
--- a/src/components/comment-content/__tests__/comment-content.test.tsx
+++ b/src/components/comment-content/__tests__/comment-content.test.tsx
@@ -22,6 +22,8 @@ type TestComment = {
   edit?: {
     timestamp: number;
   };
+  error?: unknown;
+  errors?: unknown[];
   number?: number;
   original?: {
     content?: string;
@@ -126,6 +128,19 @@ vi.mock('../../loading-ellipsis', () => ({
   default: ({ string }: { string: string }) => createElement('span', { 'data-testid': 'loading-ellipsis' }, string),
 }));
 
+vi.mock('../../error-display/error-display', () => ({
+  default: ({ error, inline, showImmediately }: { error?: Error; inline?: boolean; showImmediately?: boolean }) =>
+    createElement(
+      'button',
+      {
+        'data-testid': 'error-display',
+        'data-inline': String(Boolean(inline)),
+        'data-show-immediately': String(Boolean(showImmediately)),
+      },
+      error?.message || String(error),
+    ),
+}));
+
 vi.mock('../../reply-quote-preview', () => ({
   default: ({
     isOP,
@@ -393,4 +408,20 @@ describe('CommentContent', () => {
     });
     expect(container.querySelector('[data-testid="loading-ellipsis"]')?.textContent).toBe('Publishing');
   });
+
+  it('renders failed unpublished comment errors through ErrorDisplay', async () => {
+    testState.stateString = 'Failed';
+    await renderContent({
+      content: 'still pending',
+      errors: [new Error('spam blocker server error')],
+      postCid: 'post-2',
+      state: 'failed',
+    });
+
+    const errorDisplay = container.querySelector('[data-testid="error-display"]');
+    expect(errorDisplay?.textContent).toBe('spam blocker server error');
+    expect(errorDisplay?.getAttribute('data-inline')).toBe('true');
+    expect(errorDisplay?.getAttribute('data-show-immediately')).toBe('true');
+    expect(container.querySelector('[data-testid="loading-ellipsis"]')).toBeNull();
+  });
 });
diff --git a/src/components/comment-content/comment-content.tsx b/src/components/comment-content/comment-content.tsx
index 436bb746..d2ecf6ed 100644
--- a/src/components/comment-content/comment-content.tsx
+++ b/src/components/comment-content/comment-content.tsx
@@ -11,6 +11,7 @@ import { isPostPageView } from '../../lib/utils/view-utils';
 import useIsMobile from '../../hooks/use-is-mobile';
 import useStateString from '../../hooks/use-state-string';
 import LoadingEllipsis from '../../components/loading-ellipsis';
+import ErrorDisplay from '../../components/error-display/error-display';
 import ReplyQuotePreview from '../../components/reply-quote-preview';
 import Markdown from '../../components/markdown';
 import Tooltip from '../../components/tooltip';
@@ -63,6 +64,12 @@ const useScopedCidToNumber = (cids: string[]) => {
   return cidToNumber;
 };
 
+const getFailedCommentError = (comment: Comment | undefined): unknown => {
+  if (comment?.state !== 'failed') return undefined;
+  if (comment.error) return comment.error;
+  return Array.isArray(comment.errors) ? comment.errors.find(Boolean) : undefined;
+};
+
 const CommentContent = ({ comment: post, prependContent }: { comment: Comment; prependContent?: ReactNode }) => {
   const { t } = useTranslation();
   const params = useParams();
@@ -123,9 +130,18 @@ const CommentContent = ({ comment: post, prependContent }: { comment: Comment; p
 
   const stateString = useStateString(resolvedPost);
   const hasFailedState = state === 'failed';
+  const failedError = getFailedCommentError(resolvedPost);
 
   const loadingString = (
-    <div className={styles.stateString}>{!hasFailedState ? <LoadingEllipsis string={stateString || t('loading')} /> : stateString || capitalize(t('failed'))}</div>
+    <div className={styles.stateString}>
+      {failedError ? (
+        <ErrorDisplay error={failedError} inline={true} showImmediately={true} />
+      ) : !hasFailedState ? (
+        <LoadingEllipsis string={stateString || t('loading')} />
+      ) : (
+        stateString || capitalize(t('failed'))
+      )}
+    </div>
   );
 
   return (
diff --git a/src/components/error-display/__tests__/error-display.test.tsx b/src/components/error-display/__tests__/error-display.test.tsx
index 7b0d9d25..4a215fd0 100644
--- a/src/components/error-display/__tests__/error-display.test.tsx
+++ b/src/components/error-display/__tests__/error-display.test.tsx
@@ -102,6 +102,39 @@ describe('ErrorDisplay', () => {
     expect(container.textContent).toContain('copy failed');
   });
 
+  it('copies native Error instances with message, stack, and extra fields', async () => {
+    testState.copyToClipboardMock.mockResolvedValue(undefined);
+    const error = Object.assign(new Error('native failure'), {
+      details: { status: 504 },
+    });
+    error.stack = 'Error: native failure\n    at publish';
+
+    await renderDisplay(error);
+    act(() => {
+      vi.advanceTimersByTime(1000);
+    });
+
+    const button = container.querySelector('button');
+    expect(button?.textContent).toContain('error: native failure');
+
+    await act(async () => {
+      button?.dispatchEvent(new MouseEvent('click', { bubbles: true }));
+    });
+
+    expect(testState.copyToClipboardMock).toHaveBeenCalledWith(
+      JSON.stringify(
+        {
+          name: 'Error',
+          message: 'native failure',
+          stack: 'Error: native failure\n    at publish',
+          details: { status: 504 },
+        },
+        null,
+        2,
+      ),
+    );
+  });
+
   it('supports compact custom labels that copy plain string errors immediately', async () => {
     testState.copyToClipboardMock.mockResolvedValue(undefined);
 
diff --git a/src/components/error-display/error-display.tsx b/src/components/error-display/error-display.tsx
index 2bd4f317..b0172b31 100644
--- a/src/components/error-display/error-display.tsx
+++ b/src/components/error-display/error-display.tsx
@@ -17,8 +17,20 @@ const serializeErrorForClipboard = (error: unknown): string => {
     return error;
   }
 
+  const serializableError =
+    error instanceof Error
+      ? {
+          name: error.name,
+          message: error.message,
+          stack: error.stack,
+          ...Object.fromEntries(Object.entries(error)),
+          ...('cause' in error && error.cause ? { cause: error.cause } : {}),
+        }
+      : error;
+
   try {
-    return JSON.stringify(error, null, 2);
+    const serializedError = JSON.stringify(serializableError, null, 2);
+    return serializedError && serializedError !== '{}' ? serializedError : String(error);
   } catch {
     return String(error);
   }
@@ -54,8 +66,8 @@ const ErrorDisplay = ({ error, displayMessage, inline = false, showImmediately =
     return null;
   }
 
-  const originalDisplayMessage = displayMessage || (error?.message ? `${t('error')}: ${error.message}` : typeof error === 'string' ? error : null);
-  const canCopyError = !!error && (!!displayMessage || !!error?.message);
+  const originalDisplayMessage = displayMessage || (error?.message ? `${t('error')}: ${error.message}` : typeof error === 'string' ? error : error ? t('error') : null);
+  const canCopyError = !!error && !!originalDisplayMessage;
 
   const handleMessageClick = async () => {
     if (!canCopyError || state.feedbackMessageKey) return;
diff --git a/src/views/post/post.tsx b/src/views/post/post.tsx
index 7a28edf6..5d0541ee 100644
--- a/src/views/post/post.tsx
+++ b/src/views/post/post.tsx
@@ -235,6 +235,10 @@ export const Post = memo(
       prev?.postNumber === next?.postNumber &&
       prev?.replyCount === next?.replyCount &&
       prev?.updatedAt === next?.updatedAt &&
+      prev?.state === next?.state &&
+      prev?.publishingState === next?.publishingState &&
+      prev?.error === next?.error &&
+      prev?.errors === next?.errors &&
       prev?.approved === next?.approved &&
       prev?.locked === next?.locked &&
       prev?.pinned === next?.pinned &&