If texinfo-native is in the sysroot when mtools do_configure runs, then it will find <native sysroot>/usr/bin/install-info, but because there is apparently no hard dependency, that could be missing when it comes to run do_install.
Not sure I understand how this happens. texinfo-native is in ASSUME_PROVIDED so it shouldn't be possible to build it. mtools inherits texinfo so it has a dependency on texinfo-native (for target) or texinfo-dummy-native (native and cross).
Marking as NEEDINFO. I'm not sure how this could happen.
There's a shocking lack of detail here. I blame the submitter. There was some kind of issue, but I don't have any more information recorded unfortunately. If I see it again I'll reopen with concrete details.
As per last comments set it as verified invalid.