Unable to save Vector Smart Object.ai
I'm using Illustrator to edit a vector smart object (Starting in Photoshop and double-clicking the Vector Smart Object thumbnail in Photoshop's layers panel to open Illustrator). When I try to save the Illustrator file (Vector Smart Object.ai) it hangs on Saving... for a while and then I get an error message: "Illustrator cannot save this document "Vector Smart Object.ai" due to some unexpected errors.".

If I then try to save it again, Illustrator crashes.
Any ideas? Thanks, this is driving me wild!
MacOS Ventura 13.5.1 (freshly reinstalled)
Illustrator 27.8.1
Photoshop 24.7.0
