VC14's sscanf returns different value

sscanf-test.c

#include <stdio.h>

int main()
{
	int i, d, n, ret;
	char *strs[] = {"3", "3x", "3\x80", "3\xf0", "3\xfe", "3\xff"};

	for (i = 0; i < sizeof(strs) / sizeof(strs[0]); i++) {
		ret = sscanf(strs[i], "%d%n", &d, &n);
		printf("str=%s: d=%d, n=%d, ret=%d\n", strs[i], d, n, ret);
	}

	return 0;
}

VC7, VC10, Cygwin:

str=3: d=3, n=1, ret=1
str=3x: d=3, n=1, ret=1
str=3�: d=3, n=1, ret=1
str=3・ d=3, n=1, ret=1
str=3: d=3, n=1, ret=1
str=3: d=3, n=1, ret=1

VC14:

str=3: d=3, n=1, ret=1
str=3x: d=3, n=1, ret=1
str=3�: d=3, n=1, ret=1
str=3・ d=3, n=1, ret=1
str=3: d=3, n=1, ret=1
str=3: d=3, n=2, ret=1

When an input string is "3\xff", VC14's sscanf sets 2 to n.