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Currently, there is no specific mention of what happens with maps if the built-in template rules kick in (see 6.8.1 Built-in Templates: Text-only Copy, http://www.w3.org/TR/xslt-30/#built-in-templates-text-only-copy, first paragraph under the Note). We already mention function items, which do nothing, but one might expect that the value of a map item is to be returned. My suggestion is to make this explicit (even though the rules do already cover this).
We discussed this in Prague. ABr clarified that the current rules for function items do clearly have the consequence in text-only copy mode that nothing happens / the empty string is returned. Since some users will expect a different behavior, however, it's worth saying explicitly that for maps nothing happens. No substantive change is now being requested (even by WG members who would have preferred that the built-in text-only copy templates return the text values of maps). So this is essentially an editorial change to the exposition in the text.
Added clarification: whereever we say that the default rule for functions is to do nothing, we now say "for functions (including maps)...".