There were two problems: 1) The checking of the collision was not working with one point only. 2) For one point, the masking was checked always and if the masking was not activated, the stroke was skipped.
There were two problems: 1) The checking of the collision was not working with one point only. 2) For one point, the masking was checked always and if the masking was not activated, the stroke was skipped.