Images in test runs not rendered in exports

When exporting images in test runs, the images are not rendered correctly.

Preconditions

Create a test run for a manual test with steps.
Include at least one image in the steps.
Add a global and a step evidence image.

Steps to Reproduce

Add the provided template to Xporter (template attached).
Navigate to the test execution where the test was run.
Export the test execution using the Document Generator.

Actual Result / Attachments

Images are displayed as broken/error images.

Expected Result

Images should be rendered correctly in the exported document.