These tests didn't help me figure out the issue, but maybe they can be useful for community

7
0 0
0 2
1 1
1 3
3 1
0 -1
-1 0
3.95284707521047407042

6
0 1
1 2
0 2
-1 1
-1 0
1 0
2.82842712474619029095

7
2 0
2 3
-2 3
-2 0
-2 -2
0 -2
2 -2
6.40312423743284853117

3
0 0
1 0
0 1
1.41421356237309514547

8
1 2
1 3
2 2
2 1
1 0
1 1
0 1
0 2
3.00000000000000000000

12
2 0
1 1
0 1
1 0
0 -2
-1 1
-1 2
0 2
-1 3
-4 0
0 -4
0 -1
6.79869268479037932229

12
2 0
1 1
0 1
1 0
-2 0
-1 1
-1 2
0 2
-1 3
-4 0
-3 -1
0 -1
6.00000000000000000000

7
0 0
1 2
1 1
3 1
1 -1
1 -3
-1 0
5.00000000000000000000

16
3 0
4 1
3 1
3 2
2 2
2 1
1 1
1 2
0 2
0 1
-1 1
-1 2
-2 2
-2 1
-3 1
-2 0
7.00000000000000000000