Updated to 11.3 today and I also have this error. Any suggestions?

Updated to 11.3.1 today and the issue is still there.

Spent 40 minutes on a screen share call earlier with Apple. They couldn't solve the issue.

I am also on a MBP 2017 Touch Bar model and since updating to 11.3 and 11.3.1 I have experienced the same issue. I have spoken to Apple on Live Chat, they have taken control of my screen, tried resetting SMC, NVRAM, rebooting in safe mode, making me uninstall third party apps and are now suggesting to create a partition on the disk to reinstall the OS to see if my user profile is causing the issue. I declined in doing that because 1) they said it would be a lengthy process, 2) I don't have space on my SSD due to having bootcamp installed, 3) I have seen other posts on forums saying a clean OS install didn't solve the issue. I guess we have to wait for Apple to fix the issue via a system update.

Apple have asked me to perform a clean install of the OS on a partitioned disk which I refuse to do because, 1) I have read on other forums it doesn't solve the issue. 2), I don't have time or sufficient storage space. Having that said, I see 11.4 is now available but it won't let me update. It comes up with Download failed. Why is this and is anyone else experiencing the same issue? I have around 12GB free storage. Surely thats enough to update.

Updated to 11.4 and the issue is still here.

Updated to 11.5.1 and the problem still exists.