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Posted candidate patch upstream: https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html
After reviewing why this patch were not accepted, I agree with upstream this situation cannot happen in real dnsmasq code. It always uses values from find_pseudoheader() function or 0. But fuzzer uses value, which does not relate to incoming package. When I changed it to call find_pseudoheader as well, no detected issue ocurred anymore. Which means this issue also were in fuzzer only, not possible to trigger in dnsmasq instance.