World corruption. Large scale block corruption.

Possibly after a crash.

Images and fuller description here:

Massive fire or explosion changed my world ... why?

Some useful similar Bug report numbers in reply to that post, but correspondent said this looked like a bigger problem.

The attached crash report is recorded before the issue.

The last saves zip can be found here: https://www.daisyrust.com/minecraft/ijgrant007_Survival_Mode-Gogo.zip

World Location: 3804.676 / 70.00000 / -3758.721

Thanks.