Swiping “further right” on an iPhone SE 2022 (with screen resolution of 750x1334) only completes tasks, and doesn’t set a reminder. I can intentionally swipe screen’s left edge to right edge, and tasks are merely completed. Please adjust the determination for “further right” threshold based upon % of screen width and not a number of pixels.
Noting this here in our bug fix doc. Thank you for the catch, the reminders swipe was added fairly late into the beta.