Memorable MemberYes, I understand, but I think, it is still "by design" bug.
Currently, when I choose "Last" n "Months (Calendar)", Power BI return n last months, but only full completed months in the past.
But business understanding and business requirements are different.
If business want see whole current month, it mean data from whole current month, today (22/02/2021) it mean from 1/02/2021 to 28/02/2021 (no matter that is not completed)
If business want see last 12 whole months, it mean data for last 12 whole month, including whole (incomplete) current month, today(22/02/2021) it mean from 1/03/2020 to 28/02/2021 (no matter that is not completed).
And be sure The end date of Feb 2021 is not 2021/2/14
Business typically need see daily progress of current month with compare with last n month. Or maybe with some forecast, but again last n months including current month. For business is uninteresting information about month competed in the past without current information. At this century business typically work with interactive dashboard on daily basis (not only at first day of month).
Yes in '90 when DWH processed data once per month and business see data few weeks later, it was ok to see only completed months in the past. But now is year 2021 and be able to see historical values with current one, is most common option.
Additionally reason, in Power BI all filter are connected with AND operator, and is impossible to some relative filter (with "<") add (with OR connection) also current month filter. When will relative filter works with "<=", is easy add second filter to filter out current month.
The most important message. In Power BI (which proclaimed as seamless and easy by Microsoft) is not possible with any easy way, to use for relative filter date data, to show common business requirement "show last n whole months, including current".
I think, that it is not new idea, I don't want add some new like role-playing dimensions (which is high effort idea), it is only correction of some misunderstanding of business problem in developer team of some older good idea. And it is about adding one line of code to Power BI. I don't want change current function, but only add one more option, like "Last or This" (in slicer) or "is in the last or in this" (in filter). However, this topic is IDEA topic.