The 764 tons of hazardous materials were probably old computers, TVs, batteries, etc. that were off to China to be recycled. By 12 year old kids burning the rubber and plastic off of the wiring and melting down the circuits. To save the environment.
https://www.usatoday.com/story/news/nation/2024/03/27/coast-guard-investigates-safety-dali-cargo/73121640007/
below is one reference:
Several of the hazardous materials containers were breached, a National Transportation Safety Board official said a few hours later. Examples of hazardous materials being carried on the ship included corrosives, flammables and lithium ion batteries.