I think it is the crux of the problem.
CNN and Al Jazeera have had weapons experts examine the footage and they identified a GBU-39/B bomb in the debris of the tents. This is actually a 250lb bomb, but the warhead is the 37lb/17kilos of munitions that IDF reported.
This bomb is designed to go through 1m of soil and then 3m of steel reinforced concrete. It has a blast radius of 26ft/8m.
It does in fact ignite. I found these photos of tests where they sent one of these GBU-39 small diameter bombs through a concrete bridge to blow up a parked plane.
https://www.ausairpower.net/APA-SDB.html
Imagine the same bomb going through a thin layer of plastic and then igniting the plastic, the bedding, any cookstoves and fuel…Keep in mind a lot of the blast of fire is contained by the concrete bridge- it would rip through plastic sheeting.
IDF can’t really investigate as they are not on the ground.
I looked at satellite photos again and you can clearly see it was an evacuation camp fenced in, with UN markings.
There is no fuel tank, there is no warehouse. So the speculation that the bomb hit something else that kicked off the fire doesn’t make sense- especially since these weapons experts identified the bits of the bomb in the remains of the tents meaning it was a direct hit on the tents.