Mohammed Deif. The head of Hamas' military wing. Was killed in the humanitarian zone. Rafah Salameh. The head of the Khan Younis brigade. Was killed in the humanitarian zone.
These claims are repeated a lot. They are baseless. A critical mind and a bit of research will prove that to you.
It doesn't matter what Israel does. In Rafah Israel objectively and measurably did much better than western armies fighting against Mosul in terms of civilian casualties (and you can include those in the humanitarian zones, still better). But Israel is held to a higher standard.
EDIT: And more: Yassin Rabia, Khaled Nagar, Osama Tabesh, Ayman Mabhouh, Samer Ismail Khadr Aby Daqqa. Fact check me. Also Israel has documented rocket launching from humanitarian zones. Israel has also retrieved bodies of hostages (including Hersh Goldberg) from tunnels under humanitarian zones.