I found the solution, it was the 'blur force' script with the class 'conky-semi' (and not unchecked blur
in Desktop effect
setting) like written in the Why conky not fully transparent - #5 by petsam
I found the solution, it was the 'blur force' script with the class 'conky-semi' (and not unchecked blur
in Desktop effect
setting) like written in the Why conky not fully transparent - #5 by petsam