"Whether it's a bug or feature, the community has to decide.👍🏽"
Members of the community may have the opinion that it is a 'bug' or that it is 'a feature", but t;s the application's development team that gets to make the decision.
"It definitely is a bug for me as it adds more steps for me which the app could automatically take care."
That "it adds more steps 'for me'" might make it a "bad design", but doesn't make it a "bug."
But back to the topic of discussion.
"Paste and Match Style" means paste the data and apply the style set for this type of data at this location. f you copy a set of Date and Time values formatted to display January 14 2022 as 2022-01-14, then use Paste and Match Style to paste those dates into a range of cells set to display Date and Time values in the format 14 Jan, 2022 and to not display the time part, the date copied as February 2 2022, when pasted into those cells will take on the format set in the receiving cell and display as 02 Feb, 2022.
In the case you describe—pasting multiple rows of date and time values into the last row of a table—those D&T values pasted into the last row will take on the format already set for that rowset for that row. But the rest of the D & T values are being pasted into newly created rows,and those new rows are created by the need for rows to contain those dates, NOT by the user manually adding rows to the table. With such a creation it is plausable to suggest that no specific format has been set for D&T values in cells in the added rows that can be expected to be filled with D&T values.
With that in mind, having an "automatic" data format set for those cells a plausible outcome.
Recommended procedure:
Add the rows manually, then select the cells and format them as you want them to display, then use Paste and Match Style to paste the D&T values into those rows.
Regards,
Barry