The Wikipedia article mentions that chitin's degradation products are still recognized. Do you think these chitinases would break the bonds enough to bypass immune recognition?
It seems likely to me that people with latex-fruit allergies would also be allergic to the breakdown products from non-human chitinases, whereas those with shellfish and dust mite allergies would also be allergic to the breakdown products from human chitinase. Either way, it is likely to be a food allergen.