Earlier this year, a significant issue was discovered involving data loss for some users, where repls would either be empty or changes to files would not be saved after reloading. Initially addressed through unstructured bug fixes, the problem escalated in mid-July, prompting a comprehensive investigation that revealed longstanding bugs that were silently corrupting data, some of which were load-bearing and could not be fixed in isolation. The team initiated a structured approach to address the issue, involving reverting recent deployments, logging and monitoring data loss points, discarding corrupt data while salvaging what was possible, and ensuring no further corrupt data was persisted. This involved a detailed examination of the filesystem snapshotting process and tackling issues such as a bad interaction in Golang’s exec.Cmd and limited disk space, which caused truncated stdin/stdout without raising errors. By the end of July, solutions were implemented to prevent further data loss, and proactive steps were taken to enhance system robustness, resulting in faster and more responsive repls, especially in multiplayer settings. Key lessons learned included the critical importance of addressing data loss immediately, the value of measurement and logging before implementing improvements, and the opportunity to enhance systems once an issue is identified.