What does greyed out backround colour for .uassets represent?

I have no sound in editor for my C++ project. Running .exe after packaging it does have sound in game. When I create fresh C++ project sound works as it should in editor.

The only difference between projects I was able to find, is displayed in the bellow image (ignore the “Redirector” filter).

I could not find what background colour of .uassets represents. Any info on this subject would be much appreciated. As it should help me find a solution to my problem, since greyed out submixes .uassets seem to be imporant … I think.

332130-ue-grey-normal-uasset.png

I knew the disabled filter would cause miscommunitcation. Took another screenshot … the assets are not Redirectors.

Hello! On second screen there are redirectors, not assets.