Mouse selection disappears when scrolling up

[Alphare]

I often use my mouse to copy-paste chunks of terminal output, and sometimes overshoot (especially since streampager scrolls page-by-page instead of line-by-line like I'm used to), so I scroll back up to re-adjust. In streampager, this causes my selection to be lost and I have to start again. This is not a problem outside of streampager.

[Alphare]

Thinking about it a little bit, maybe it's the fact that streampager does page-by-page scrolling that's causing the issue, I can reproduce with less when keeping my mouse too low when scrolling back up. Is the scrolling configurable?

[markbt]

streampager can scroll line by line, partial parts of the screen, or full screen (the full list of keys is in the help screen). What are you pressing to get page-by-page scrolling?