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Yes, we are doing the same thing now. You can create a Creative/Flat world/Peaceful for quick load.
I tried dropping all items from inventory but issue persisted, so it must be something else.
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Found an older Reddit post about the issue, could be linked to an invalid item in player inventory.
https://www.reddit.com/r/feedthebeast/comments/1mvtwi/gl_error_1283_stack_overflow/
Will check later.