Possible Bug in Date Tagging

I love love LOVE the date tagging feature, but either I'm not using the correct term in a particular case, or I've uncovered a bug.

If today is Tuesday, September 14, 2021, and I type in "Sunday", I get a suggestion for this upcoming Sunday, September 19, 2021. However, if I type in "last Sunday", I get a suggestion for Sunday, September 5, 2021. I would expect to get a suggestion for Sunday, September 12, 2021, but the only way I can find to get that date suggested is to use "two days ago". This seems to be true for trying to get any date that is within the past 7 days -- using just the day gives me the date for the first occurrence of that day in the future, but using "last <day_name>" gives me the last occurrence of that day that is over 7 days ago. There doesn't seem to be a way to get a date within the past seven days without doing the math and asking for "x days ago".

Am I missing something simple? Is this a bug, or is this working as designed?

Thanks for all your team does! Workflowy truly is amazing, in both its power and its simplicity!