Under very poor network conditions, sometimes I get two copies of an added task, with consecutive id’s (this is with the main desktop web app).
By ‘very poor’ I really mean it - it’s not unusual where I live to get 20% packet loss on average over the course of a day, with 30s ping times (yes that was seconds!) for stretches of several minutes.
This really isn’t a big deal, as those conditions are obviously a tad beyond the expected range for a web app, and double posting is obvious to spot and way better than data loss. I just thought it worth mentioning.