Since these CSP2323 have no dedicated thermal pad (see test) they rely on heat dissipation through the solder pads. The heat dissipation here is primarily limited by the LED board used, not by the thermal mass of the host.
This is the reason, why these are burned. The current (heat dissipation) is simply too high. I am wondering why this wasn’t the case with the older TS10, maybe they changed LED manufacturer or using another type of CSP LED. These things are manufactured by many companies in this size, so visually it is not clear if these emitters in the TS10 V2 are really LatticePower CSP2323.