every s&box addon with a parent package now fails publish with PackageBuild internal error

[Troubled Trout]

Your code doesn't compile on the server
PackageBuild internal error in package.stellysaddons.stellys_skate: System.Exception:
Couldn't find reference package.dxura.rp

any addon with a parent package hits this now, even ones parented to facepunch.sandbox. compiles fine locally and republishing the parent changes nothing