Ambiguous reference in std:: classes Follow

I see a number of ambiguous reference errors in the editor that do not occur during build.  These are against the std:: classes.

One example is std::swap, which when I do a 'peek definition' shows 2 identical definitions from utility and 2 identical definitions from xstring.  Note that the utility form should be in use.  In both cases, the two definitions point to the same line in the same file.

I've tried clearing the caches and cleaning the project, to no effect.

This is version 2018.1.1