Three-Finger Drag No Longer Works Properly for Partial Screenshots in macOS Sequoia

For years, I have used three-finger dragging to take partial screenshots (Shift + Command + 4) without physically clicking the trackpad. I simply position the crosshair at the starting corner, drag with three fingers to the opposite corner, and release to capture. Recently, the screenshot is captured almost immediately after dragging begins, before I can select the intended area. Three-finger dragging still works normally for moving windows. Has anyone experienced this issue or found a way to restore the original behaviour?