When choosing a background overlay color e.g., blue and then choosing an opacity percentage, the percentage replaces the color value.
Update 13 July 2023
I did some further checking as this issue affects a number of areas. I did a clean install of Oxygen Builder v4.6.2 and OxyProps 1.10.1 with no other plugins.
The following error occurs when I mouseover a value in the OxyProps table:
Uncaught TypeError: Cannot read properties of undefined (reading 'includes')
at HTMLLIElement.w (oxyprops-oxygen.js?ver=b4f1bd207dbf67fee62e:1:204033)
w @ oxyprops-oxygen.js?ver=b4f1bd207dbf67fee62e:1
Eddie