[Bug] Image in PDF cover page replaced by footer/header image

[levitvas]

When using an image in the cover page, it gets replaced by either an image from the header, or by an image from the footer.

To Reproduce
Steps to reproduce the behavior:

1. Create a cover page
   Image is encoded into base64

<img style="margin-top: 50%;" src="data:image/png;base64,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" alt="">

2. Create the header
   Also another base64 image

{
    "pdfHeaderTemplate": "<img src=\"data:image/png;base64,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\"><span style='font-size: 25pt;'>Header text</span>"
}

Without the header:

With the header:

Expected behavior
Being able to see different images

Context:

• OS: Windows
• Docfx version: 2.77.0

[JM2K69]

Any update about this issue @yufeih ?

[JM2K69]

Any update about this issue @yufeih ?

@yufeih @filzrev