### ImageMagick version

7.1.1-7

### Operating system

MacOS

### Operating system, version and so on

macOS 13.3.1

### Description

I recently updated to v7.1.1-7. I'm converting a bunch of pdfs to webp. There is a particular type of plot that produces a faulty output, where it has missed some points. I used to convert the images using an older version of imagemagick (I can't remember which, I just blindly ran `brew upgrade`) and it worked. For other plots, the conversion to webp has been working fine.

### Steps to Reproduce

The file is test.pdf.

I ran `magick -density 1200 -quality 100 test.pdf test.webp`. And the output is like below – the points in the top-panel plot are missing. I also ran `magick test.pdf test.webp`, `magick test.pdf test.png` `magick test.pdf test.jpeg` and the same issue happened.

I've attached the png rather than the webp as gh don't support webp.

Apologies in advance if this is a newbie mistake, but there a lot of arguments. Also I don't understand why this conversion worked on an older version of imagemagick.

Cheers

### Images

[test.pdf](https://github.com/ImageMagick/ImageMagick/files/11294541/test.pdf)
![test](https://user-images.githubusercontent.com/30835680/233607159-b1f92108-2be7-4011-8191-82af75335e8d.png)

convert particular pdf to png/jpeg/webp
This is a GitHub Issue
repo:ImageMagick
owner:ImageMagick
Title : convert particular pdf to png/jpeg/webp
Issue date:

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### ImageMagick version

7.1.1-7

### Operating system

MacOS

### Operating system, version and so on

macOS 13.3.1

### Description

I recently updated to v7.1.1-7. I'm converting a bunch of pdfs to webp. There is a particular type of plot that produces a faulty output, where it has missed some points. I used to convert the images using an older version of imagemagick (I can't remember which, I just blindly ran `brew upgrade`) and it worked. For other plots, the conversion to webp has been working fine.

### Steps to Reproduce

The file is test.pdf.

I ran `magick -density 1200 -quality 100 test.pdf test.webp`. And the output is like below – the points in the top-panel plot are missing. I also ran `magick test.pdf test.webp`, `magick test.pdf test.png` `magick test.pdf test.jpeg` and the same issue happened.

I've attached the png rather than the webp as gh don't support webp.

Apologies in advance if this is a newbie mistake, but there a lot of arguments. Also I don't understand why this conversion worked on an older version of imagemagick.

Cheers

### Images

[test.pdf](https://github.com/ImageMagick/ImageMagick/files/11294541/test.pdf)
![test](https://user-images.githubusercontent.com/30835680/233607159-b1f92108-2be7-4011-8191-82af75335e8d.png)

--- end body ---

None