Taking a screenshot after scrolling is generating a bad image

I'm using Backstop 5.3.0 and scrolling to the bottom of the page is generating an image with some blank content.

I also noticed that the bigger the scroll, the worse the image.

No scroll image (it shows the page correctly):

1/4 scroll image (there is some blank content, specially at the bottom of the file):

1/2 scroll image (more blank content):

complete scroll image (even more blank content):

Code example:
https://replit.com/@jkevingutierrez/backstop-scroll#backstop_data/engine_scripts/puppet/onReady.js

Note: The code can't be run in replit because of some missing binaries, but it can be run locally

Also, it works well in v5.1.0, the problem occurs in v5.3.x