select-area corruption with vi-mode and mouse-dragging past last line

Issue description

When dragging with the mouse past the last line, the selection suddenly becomes unresponsive and can't be recovered. This seems related to auto-scroll behavior when there is nothing left to scroll to. It only happens with vi-mode selection (set -g mode-keys vi).

Reproduction steps:

• set -g mode-keys vi
• set -g mouse on
• Fill the window with text
• Mouse-drag on the last line and then move past it downwards
• Result: the selection doesn't follow the mouse anymore

Required information

Please provide the following information. These are required. Note that bug reports without logs may be ignored or closed without comment.

• tmux version (tmux -V): tmux 3.5a, but also reproducible with tmux 3.8-dev (head)
• Platform (uname -sp): Linux (Debian stable)
• Terminal in use (xterm, rxvt, etc): foot
• $TERM inside tmux (echo $TERM): tmux-256color
• $TERM outside tmux (echo $TERM): foot
• Logs from tmux (tmux kill-server; tmux -vv new): not required I think, but I can provide them