Only the compare revealed the copying errors. I too was shocked when I saw them and when I used Window's Event Viewer to look at the error logs, there was nothing there to indicate any device errors. The first time this happened, I wiped the T7 by reformatting it and tried the copying again, and got the same results, although the copy errors were in different files and the missing files were different. I tried this several more times with two other T7 drives and got similar results. The files being copied were about a TB of RAW files from my Canon still cameras along with associated .PSD files.
In all cases, the drives were connected to my PC using USB C to a native USB C port on the PC. I tried four different USB cables to rule out a bad cable and it didn't make a difference.
I tried the same tests with several T9 drives and never saw any binary copy errors or missing files. At this point, I have zero confidence in the T7.