A link to the Al Jazeera article and video: https://www.aljazeera.com/news/2023/10/19/what-hit-ahli-hospital-in-gaza
A Channel 4 News investigation also confirms that Israel's audio tape of “Hamas operatives discussing the rocket malfunction" is a fake with their experts saying that the tone, syntax, accent and idiom sound absurd and not credible: https://www.channel4.com/news/who-was-behind-the-gaza-hospital-blast-visual-investigation
This would also not be the first time that the Israeli government has lied about "misfired Palestinian rockets": https://mondoweiss.net/2022/08/after-initially-blaming-palestinians-israel-admits-to-airstrike-that-killed-5-children-in-gaza/
The Israeli army has been trying to prevent international journalists and independent bodies from entering Gaza to act as independent investigators: https://www.youtube.com/watch?v=60EK-3-kGLI
Dumb question time, for all of the explosions shown in their video footage, not just at the hospital, nome show rockets in the air first. They be going to fast to be seen?
Not clear what the munitions were, but many types are guided bombs or shells, which don't have any propellant of their own, just fins for aerodynamic control.