Unable to undo completion of habit

[Adikso]

I created a new habit with when="every week", then I marked it as complete. Now when I press "undo" it says "No completions to undo. This habit hasn't been completed today". Habit is marked as completed on the list.

[dohsimpson]

Could you provide the data/habits.json and data/settings.json files. I'll try to reproduce the issue, but that is not supposed to happen.