How to make xfce4-terminal scrollback the terminal when pressing shift-pgup/pgdown while in vim

After a recent Ubuntu upgrade, behavior of using vim inside an xfce4-terminal has changed. Shortcut keys "Shift+Page Up" and "Shift+Page Down" are mapped in xfce4-terminal to "Scroll one Page Up" and "Scroll one Page Down" respectively, i.e. they emulate the behavior that UNIX terminals had for decades. Unfortunately, once I start vim in a terminal, it looks like those keys are no longer handled, as it does not scroll back the terminal to the content that was before starting vim. Using xterm instead of xfce4-terminal, everything works as expected. Is there any setting that will allow me to restore old UNIX behavior and not have the terminal act differently, depending on what is currently running in the shell? xfce4-terminal is 1.1.3, vim is 9.1.