Read the original on Steam ↗Blender 4.2.23 LTS features important bug fixes. It is released on the v4.2 - Stable - LTS branch.
You can switch to this by right-clicking on the Blender entry in your library, select Properties.... Open the Betas tab and select v4.2 - Stable - LTS.
Patch Notes
* Assert when undoing Make Single User with a linked mesh. (#161211)