Pattern Preview looks different than the actual design.

[tirth-doshi-techno]

Describe the bug
I am Creating a custom pattern to Contribute to WordPress. In the Editor, it looks perfect but when I save the pattern and Preview it, It doesn't look what I Created.

Here's the Screenshot of the editor page

Here's the Screenshot of the preview page

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Patterns'
2. Try to create a pattern similar to the one provided in the screenshot.
3. Save as a Draft and See the Preview.
4. See error

Expected behavior
The pattern in the Preview should look same as it looks in the editor.