That's precisely the issue, France likewise still disputes the number of deaths from it's occupation of Vietnam and Algeria, recent figures estimate 1.4 million for vietnam, and 8 million dead for algeria. We'll probably know the figure in more than a decade for Palestine, if there are any palestinians left by then.

The only research document I know of that touches on it is this paper published in the The Lancet in 2024, it's peer reviewed and estimates 186 000, but that was 2 years ago:

https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(24)01169-3/fulltext