Cannot change description and button label

In post.ts I changed all labels, but somehow they're not changed in the side, only background is new. What have I missed?

  return await reddit.submitCustomPost({
    splash: {
      // Splash Screen Configuration
      appDisplayName: 'Arithmetic Rush',
      backgroundUri: 'default-splash.png',
      buttonLabel: 'Start Playing',
      description: 'Test your math skills! Solve addition problems as fast as you can.',
      heading: 'Ready to Challenge Your Brain?',
      appIconUri: 'default-icon.png',
    },
    postData: {
      gameState: 'initial',
      score: 0,
    },
    subredditName: subredditName,
    title: 'Arithmetic Rush - Math Game',
  });

Screenshot