It looks to me like it melted either from heat or chemical. That would also explain why there is no trace of the missing liner. 40fan might be onto something with the light that appears right above it. Perhaps a weird prism heating event.
It looks to me like it melted either from heat or chemical. That would also explain why there is no trace of the missing liner. 40fan might be onto something with the light that appears right above it. Perhaps a weird prism heating event.