Why does the geometry brush cause surfaces to disappear on other brushes?

I don’t know exactly why this is happening but for some reason Whenever I stretch a piece of geometry and it clips with another this happens.

Here is a video and a screenshot demonstrating the problem. Is this a bug or something I am doing wrong?

[Video][1]

Hi Mojobojo,

This is a known issue that is affected by the sphere and the cone brush. It has been documented with a bug report.

Thank you!

Tim