Projections onto sketches not locked

Here is my workflow in this situation:

I create a sketch from a face or construction plane. I want to reference other geometry from an existing part of a body, so I select “project” from tools and select the geometry I want, and the app automatically targets the sketch/plane that I’m working from. All good. The problem is, once I return to sketching, the projected geometry is all blue, and is not locked to the other body.

I’ve tried this several ways. It consistently does this if I’m working from a sketch or a construction plane. It will do it if I am working from a plane touching the projected body or not.

I exclusively model using the iOS app and an Apple Pencil.

Enable Linked Sketch in parameter card