Unexpected movement of arcs and circles in "fully defined" sketches

[Anonymous]

I'm trying to detail some "dogbone" cutouts for CNC plywood parts, and I'm having an issue where the circles and arcs I use start to move around if the part changes. Specifically, they sometimes flip to the wrong side of the rectangle they're positioned on. The sketches appear to be fully defined, but things start getting buggy and jump around if I drag on parts of the sketch.

Perhaps there's a constraint I could be adding to solve the problem? When I try to add things like a tangent relation I typically get errors that the sketch is over-constrained. 

[Phil.E]

Can you export as F3d and post the model here? The best way to fix this is with your model.

Thanks,

[Anonymous]

Example file attached. I get the problem when going back in the timeline and changing the extrude distance of Extrude 1.

Thanks for taking a look at this! It's been a bugging me for a while.

[Phil.E]

I was able to reproduce it. There is definitely a problem there. Thanks for reporting it! (internal reference FUS-29404)

You may need to reconstruct the sketch a different way. I made the same shapes using center to center slots. Once everything was constrained, it does not fail at all.

See attached file.