How do I stop extrude "Up to part" regeneration errors?

I'm having an issue with a design I'm making. The extrusion labeled "medium diags", I wish to extrude sketch 8 up to the extrusion labeled "short diags" but it informs me I have a regeneration error and that I should check my inputs, yet this same sketch has worked on several other planes and has no issue extruding blind. Other extrusions on this part studio have had no issue, including ones extruding through one part up to the one selected such as "rear vert" and "bottom for-aft tubes".

Is there a way to rectify this and any good practice I can incorporate in future to prevent it happening again?

Cheers

https://cad.onshape.com/documents/d1d95e5b8fe95691bd68e09d/w/f423344d43f00d6cd57e124a/e/50ceec6974f6bb2ef12859c8


Answers