hopefully they got reported as bugs, I spent some time in June making sure a basic Arch Linux system can compile itself using uutils, and things mostly worked, the only build failures could be argued were shell scripts depending on undefined behavior, like "calling install(1) with multiple -m arguments":

https://github.com/uutils/coreutils/issues/8033

The other one was an edge-case with dangling symlinks:

https://github.com/uutils/coreutils/issues/8044

Both got fixed promptly, after taking the time to report them properly. :)