For the benefit of anyone who may come across this thread after experiencing similar errors:
Despite the disappointing check summary, I pressed on with the build and was able to complete it successfully without further problems. Subsequent packages tested well, and the resulting system booted without a hitch. So, if your goal in building LFS is to create a sandbox system for experimentation and education, there's a good chance you can safely ignore the sorts of errors I quoted in the OP.
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