Interesting to note in the earlier representation there's a graveyard at the east end of the chapel, I assume there has been some investigative evidence for the artist to place graves there - Although most would say highly likely anyway, probably graves within the chapel too, perhaps the Preceptors' themselves (choice real estate for the dead to be inside)
Wonder if there are any Knights that campaigned in the Holy Land buried there?
(wiki):
"The Hospitalier grand master Guillaume de Villiers or Guillaume de Clermont defending the walls of Acre, Galilee, 1291":
The Siege of Rhodes 1480, Hospitallers Ships in the foreground:
exciting stuff.