This may be something similar to the accident involving B200, G-PCOP here in the uk , both wings ( same construction as B300) on PCOP buckled at or near the overwing fuelling points following what was believed to be a repeated loss of control in IMC. The occupants were lucky that the aircraft recovered without complete structural failure occurring. Having been directly involved in the damage assessment and subsequent repairs ( both outer wings were replaced with new) the missing parts of the wings on this recent accident seem to correspond to where PCOP’s failed.
https://assets.publishing.service.go...PCOP_06-07.pdf