What was the 200MB patch about on the 21st December 2021?

[XHelperZ-2236]

1.67 Known Issues

Disclaimer: This is not a complete list of all currently tracked issues affecting this build of Overwatch, rather this is a targeted list of some known specific issues with this release. Patch 1.67 Voice Chat Change – Volume Boost: This feature has been temporarily disabled and delayed to a future patch Our voice chat now runs through our audio system, resulting in higher volume This comes along with new default values: “Voice Chat Volume” Voice Chat Mic Volume” both set to 80 You may need…

Could be that it was something that disabled this patch temporarily.
Though all we can do is guess.