Willem,
Here is an alternative, and perhaps better, explanation to what I first tried to imply.
Below is one of my parang (unfortunately an ilang but the rest resembles Roy's quite a lot), probably from the Baram river up north of Sarawak, with several similar features as Roy's.
Imagine that you broke the tip after the first "stair step".
To regain the lost blade esthetics you then try to insinuate the other two (now lost) stair steps with small cuts to retrieve the harmony of a stair case of three again.
Due to lack of space between the original stair step and the new tip there is unfortunately only room for an almost insignificant rounding of the tip which make it almost square in appearance - and voilą!
Michael
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