It’s a non-issue. If I choose a custom range of Jan 2, 2022 through Dec 30, 2022, the generated report will nevertheless be titled
Activity Statement January 1, 2022 - December 31, 2022
In other words: Jan 1 “activity” is automatically included in Jan 2, and similarly for Dec 31.
Which may be kind of weird from a UI perspective… but is convenient. 