Without that, the following happens:

1) ShapeTypeContext::onCreateContext() in oox calls rAttribs.getToken()
2) FastAttributeList::getOptionalValueToken() in sax calls mxTokenHandler->getTokenFromUTF8()
3) OOXMLFastTokenHandler::getTokenFromUTF8() won't find the oox token and return OOXML_FAST_TOKENS_END

I verified that the new gperf input just adds tokens to the hash,
doesn't remove any.