This problem applies to all the documents that I have ever opened.

Configuration:
- Web browser and its version: Google Chrome 83.0.4103.61 , also Firefox 76.0.1
- Operating system and its version: Win 7 x64
- PDF.js version: 2.3.164 version of extension
- Is a browser extension: yes

Steps to reproduce the problem:
1. Select any "Spreads" mode of view. Or "No spreads", but wrapped scrolling mode - doesn't matter. 
2. Select "Page Fit" zoom mode. We should get several pages per screen
3. Try to scroll document by any of keys: Page Down, n, j, Space Bar

I expect to see the next group of pages (for example, if there are 5 pages on the screen, I expect to see the next 5 pages)

What went wrong? Scrolling goes one page at a time, so if I have 5 pages on the screen, nothing happens when I pressed Page Down 5 times . For the 6th time I finally see the next group of pages.

Just for example: Adobe Reader scrolls properly in two-page mode, 2 pages at once. 

P.S. Sorry for my English, I hope I correctly stated the essence of the problem
this._scriptingInstance?.scripting.dispatchEventInSandbox({
      id: "doc",
      name: "WillPrint",
    });
    if (this.printService) {
      
      
      
      return;
    }
    if (!this.supportsPrinting) {
      this.l10n
        .get(
          "printing_not_supported",
          null,
          "Warning: Printing is not fully supported by this browser."
        )
        .then(printMessage => {
          this.error(printMessage);
        });
      return;
    }
    
    
    if (!this.pdfViewer.pageViewsReady) {
      this.l10n
        .get(
          "printing_not_ready",