lomiri shell: spread touch is off / broken

How to reproduce this issue:

• Install Debian 13 minimal on physical hardware that has a touch display (e.g. a Yoga notebook, a tablet like device, etc.), and run apt install lomiri afterwards. Reboot.
• Log into Lomiri via the greeter
• Go to the system indicator (indicator bar, the very right icon) and disable "Desktop Mode" / "Computer Mode", this should set the Lomiri shell into "Staged" usage mode. App windows switch to fullscreen and the side stage becomes usable.
• Launch some applications to play with via the spread.
• Now swipe in from the right, enabling Lomiri's spread, try to close some apps or bring them to foreground
• Observe.

What you will observe:

• After swiping in from the right, you won't be able to e.g. activate an app and bring to foreground. Always the app on the very left will come to foreground.
• When you try to swipe and app up or down (with the intention to close it), you will also bring the most left app to foreground
• If you swipe in from the right, wait and then swipe in again (so that the spreaded apps bounce to the left), then the apps can be dragged up/down or activated

What should happen:

• Swiping to the spread should always lead to apps being draggable for closure or touchable for activation / foregrounding