Example solution 4 in d931c21c probably has extra red dot

[burnpanck]

The upper-left corner of the red outline of the lower closed shape has no reasonable rule backing it.
All other examples (and the test-case result) follow the rule that the red outline is the dilation of the blue shape.

[SmartManoj]

Yes.

https://arcprize.org/play?task=d931c21c