During March 2025, contributed to the MeanderingProgrammer/neovim repository by enhancing the stability of the diagnostic module through a targeted bug fix. Addressed an issue where autocommands related to virtual lines were being cleared for invalid buffers, which previously led to errors and reduced reliability. The solution involved implementing buffer validity checks and refining autocmd lifecycle management using Lua and Vimscript, ensuring that autocommand cleanup only occurred for valid buffers. This improvement reduced hard-to-reproduce errors and strengthened the resilience of the diagnostic subsystem, resulting in more reliable diagnostics and improved compatibility for downstream plugins that depend on buffer lifecycle events.