"Find Includes" is case-sensitive but MultiExcerptInclude is not (page name)
Steps to reproduce:
create a multiexcerpt and a multiexcerpt-include that includes it
in the include, change the case of part of the page name so that it is different than the actual case of the page name, like "test" vs "Test".
notice that "Find Includes" does not find the multiexcerpt-include unless the page name in the include exactly matches the actual page name (case-sensitive)