I mean if the id="A-26" and id="a-26" both exists in the same file, google ebooks may get the destination wrong as it seems to treat them as identical (they compare using a case-insensitive manner) whereas the epub spec clearly states they should be treated as different ids (ie case sensitive comparisons). Both Sigil and calibre follow the spec. This can be an issue with the ids used in the opf as well.
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