While this specific sub-version is primarily about reliability, it carries all the flagship features introduced in the Capture One 22 cycle:
Fixed floating tool keyboard shortcut bugs and issues where adjustment layers wouldn't load in the correct order. Capture One 22 Pro 15.4.2.12
This specific version (15.4.2) addressed several critical performance issues: Capture One 22 Pro 15.4.2.12
Added support for certain Canon models (like the R5 and R3) to shoot directly to a computer without cables. Stability and Bug Fixes Capture One 22 Pro 15.4.2.12
Improved the stability of remote sharing sessions to prevent unexpected disconnections. Hardware & Performance Capture One 22 (15.4.2) release notes