https://en.numista.com/catalogue/pieces13420.html
It was caused by a blocked die - where the edge lettering had R blocked to look like P and
there are many combinations, where
any of the five R letters in
REMEMBE
R REMEMBE
R THE FIFTH OF NOVEMBE
R
can be blocked - I had one where all five were blocked.
An old night-time picture I made years ago shows one example ...
REMEMBER REMEMBER THE FIFTH OF NOVEMBER
so only the first R was faulty on both those coins.
Maybe yes just add one line, not many combinations thereof.