Well, unverified rumors promise a fix in 18.1 or 18.2 or ...
I had enough pain to realize I would be better off with a clean reset, no restore from time machine (no, none, rien...) despite the pain, because it would avoid a lot of bleeding. Once I made that decision, I felt better. And the phone and camera and apps have been working flawlessly ever since.
I worry that Apple does not have the software to examine every time machine uploaded and downloaded a file, looking for malware that somehow escaped their control over the AppStore.
I can't prove it, of course, but I feel confident that there have been thousands upon thousands (and maybe millions upon millions) of iPhones whose timemachine backups contain poisoned software that could have been poisoned by accident (memory corruption) or on purpose (beware of the black arts here).
Apple did this to me once before, maybe 6 to 8 years ago, when my iPhone was crashing but they said it must have been my software! My software? All of my software was downloaded from the Apple app store. They told me the only solution would be to do a complete, clean erase and manually reinstall all the software I had and so forth. Either that or buy a new iPhone and do a fresh install of all the software and whatnot.
I understand how checksums and CRC encoding work. Why doesn't Apple thoroughly test every file on your machine and in your backup to determine where the flaw is coming from? Maybe they've figured out how to fix all these phones and the fix will be delivered before Halloween as a treat for the world. Or maybe not.