Widget Annotation: PageOpen (/PO) and PageClose (/PC) events are not reacted upon

[agrahn]

Attach (recommended) or Link to PDF file here: triggers.pdf

Configuration:

• Web browser and its version: Firefox 126.0.1
• Operating system and its version: Gentoo Linux
• PDF.js version: 4.1.379
• Is a browser extension: no

Steps to reproduce the problem:

1. Open the attached two-page PDF. On the second page, there is a pushbutton that, within its AA (AdditionalActions) dictionary, defines actions for the PageOpen/PageClose (/PO and /PC entries) and for the MouseDown/MouseUp (/D and /U entries) trigger events. As actions, appropriate debug messages are written into the browser console.
2. When scrolling forth and back to and from the page with the Widget Annotation, the expected debug messages PageOpen and PageClose should be printed into the console.

What is the expected behavior?

When scrolling forth and back in the 2-page document, corresponding debug messages should appear in the browser console.

What went wrong?

Nothing happens when scrolling between the document pages. Thus, PageOpen and PageClose do not trigger the associated actions. Only mouse interaction with the Widget Annotation is functional, MouseDown and MouseUp events are reacted upon and corresponding debug messages appear in the browser console.