Yes, unfortunately I wish it were just a plugin. Went through all the steps with apple (deleted all plugins, reset plist, etc.). Even did a fresh logic install (no plug-ins/no migration) on a brand new machine. I can replicate the issue anytime anywhere. I can even do it at the Apple store on their demo machines using their demo project. If you gave me 2 minutes with your machine I could show you, too. It's a sonoma bug--but fortunately only comes up with certain workflows and doesn't seem to affect audio--most importantly. Apple is "working on it" (slowly).