Turning 'Ignore Parts' off when using the draw tool in the terrain editor causes issues

Hello! I’ve recently been running into an issue with the terrain editor. When the Ignore Parts option is turned off and I try to draw some terrain going off from a part, I’d expect a small blob of terrain to be created where the part is. However, an enormous line is created in the direction your camera is looking. See the attached video:

This bug has been happening for a while now and it’s quite disruptive, especially in the context of a game centered around floating islands.