Here is another log from a different server, owned by a different owner that also had a missing chunk at 0,0 on PREGEN6K.
Summary: Missing chunk at 0,0 when using the PREGEN6K map on a server. It happened at around Dec 11th 18:00.
Platform: OS - Linux (Ubentu Server), CPU - AMD Ryzen9 3900X, Memory - 64GB (DDR4-3200 ECC)
Game mode: Dedicated Server
I will give the link for the map datas for before and after the incident, as well as the output log to one of the QA team members through discord. I'm sorry I can't paste it here, but the server owner is concerned about who the files are visible to.