QtCreator weird black background on overloaded operators with the keyword text underlined

Hello,

as described in the summary, when you set into the text editor fonts & color an underline on keywords, the overloaded operator becomes with black background.

I don't really know if it was supposed to be a bug or it is done on purpose, and I don't know if it occurs in later versions, but I assume it does if it hasn't been seen yet.

The examples are attached.

The only fix I've found for it is to set the background color of the overloaded operator to the text background color.