I think the problem might be related to the fact that you're using an id reference that starts with an underscore character. In HTML, id references should start with a letter, but can then contain underscore characters within the id. So perhaps, instead of "_toc1", if you used "toc1", it might work. I can't see anything otherwise wrong with the OPF guide item - I've certainly never had any problem getting a MOBI ebook to open at a specified page using that method.
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