Once a Week Habit, first day a week on Sunday

[faspina]

I am running in Docker
First Day of week set to 6
I have a 1 time a ever 1 week Habit

Today is 4/26 - if I mark sunday 4/20 I get a double check but the rest of this week does not get checked. If my first day of the week is Sunday it should.
If I mark any day Monday 4/21 through 4/26, the whole week gets checked

When I drill into the habit, I see the top day of the week is Monday not Sunday , same behavior on that screen , click sunday 4/26 check the previous weeks

Is this expected?