Rubber tracks (and roadwheel tyres) don’t generally melt when the vehicle catches fire. If the rubber gets hot enough, it will start to burn and leave behind pale grey to white ash. Since the suspension of the M50 involves rubber springs, though, those would burn away and the vehicle drops to the ground, as far as the suspension arms will let it anyway. The tracks would probably retain some of their rubber parts, away from the actual vehicle fire, and you’d have steel cables (possibly snapped because of the heat) visible instead where the rubber did burn away.
Another consideration, not about the tracks, is that Ontos crews tended to stash spare ammo inside the vehicle, because it had very limited ammo stowage. Many apparently even removed the commander’s seat and had him sit on a pile of ammo instead
I mention this because the main cause of fires in AFVs is the propellant of spare ammunition, when that gets spilled and set off by hits that penetrate the armour.
Another consideration, not about the tracks, is that Ontos crews tended to stash spare ammo inside the vehicle, because it had very limited ammo stowage. Many apparently even removed the commander’s seat and had him sit on a pile of ammo instead

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