The secondary actions for notifications and the timestamp define a secondary block of information below the main notification information. However, the actions and the timestamp look misaligned (notice the blue and green areas not matching), and slightly separated from the bottom border (highlighted in red):
Align the items and remove the extra space below them:
Note that the final result will result in the total hight reduced by removing the extra space (in red), the space has not been reflown in the mockups for illustration purposes. For other space considerations, you can refer to F3363922.
The final result will also benefit from T125968: Increase separation between the content excerpt and the notification text.