Every time I press return/enter or space in the comments code completion suggests the expect() from the Nimble framework
https://stackoverflow.com/questions/69442228/xcode-13-autocompletes-text-in-comments
I tried installing XCode 13.1 over XCode 13.0 to no avail.
This really makes writing comments more of a chore than it has to be.
I cannot reproduce the issue neither with Xcode 13 nor Xcode 13.1 RC. I do not know what Nimble is, but if you once installed it in any of the projects on your Mac, it might be affecting. Better try the same thing on a brand new Mac (on which you have never used Nimble thing). Even if that was not the cause of the issue, you may need to find the condition to reproduce it.
O did not reproduce either in Xcode 13.1 playground.