TexTools is a UV and Texture toolset created several years ago for Blender and Max by @renderhjs. In this open repository, originally created by @SavMartin, we develop the current version of this popular Blender add-on.
I updated master, can you try to change the color space of the bake choosing one of the preferences added in the bake panel or the addon settings, and tell me if it works now?
I've seen this before in other tools that set up baking.