scrolling with WHOLE_PAGE option doesn't work

[Regis111]

Hi, I am trying to accomplish taking screenshots of whole page. When I use:
Shutterbug.shootPage(webDriver,ScrollStrategy.WHOLE_PAGE).withName("wholepage").save();
I am only getting one screenshot of head. I also tried:
((webDriver) JavascriptExecutor).executeScript(window.scrollBy(0,100));
which also didn't work. Seems like I have problems with proper scrolling. Can I ask for help or any guide?

I use:
Chrome - 76.0.3809.87 (64-bit)
selenium-shutterbug - 0.9.2