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When flash erase size is equal to flash write size, bytes outside the range of the write block are not changed. Is this true?

I reserved a small flash area of a 18f45k22 to save some variables.
A device returned with this area erased.
How is this possible ?

Compiler version is 4.120.
I found that if I try to compile a file created months ago the problem doesn't occur. If I rename that file and try to compile it the problem occurs.

I have the same problem with this small code
#include <18F45K22.h>

void main()
{
}