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The 1.20.4 Update Incident was a major server incident that happened on January 5, 2024. It caused the server to crash multiple times, and the splatter map feature to not work on the ImageOnMap plugin which led to a new plugin being installed.
Cause
Server Crashing
It was speculated by Victor that the server's disk was having issues, which is the most likely cause.
IOM Splatter Map Not Functioning
IOM has not been maintained since July 13, 2022, and has been stuck on 1.17/1.18.1. Due to this issue, a new plugin was implemented and nearly all ImageOnMap maps were migrated.
Events
January 5, 2024 at 11:35 UTC: Server updated to 1.20.4
January 5, 2024 at 19:00 UTC: The server performance started to drop, people speculated that it was caused by WorldEdit but it got disproven quickly.
January 6, 2024 at 07:26 UTC: Server crashed for the first time since updating.
January 6, 2024 at 08:50 UTC: Investigation for the crash started.
January 7, 2024 at 00:08 UTC: A server downgrade from 1.20.4 to 1.20.2 was attempted but failed due to "world data being updated".
January 7, 2024 at 00:28 UTC: A server rollback back to 1.20.2 from a backup was planned, but got cancelled due to the bnbmc2 world not having any backups yet.
January 8, 2024 at 02:34 UTC: Server went down to perform a physical server upgrade for the disk.
January 10, 2024 at 12:41 UTC: Server went back online, but the ImageOnMap plugin had to be replaced due to issues.
Aftermath
The server disk had to be upgraded due it having writing issues, and a migration from ImageOnMap to ImageFrame had to be performed due to it not functioning correctly on 1.20.4, nearly all maps were migrated.