WordPress plugin add constructed stylesheet with display none in a class

I have a plugin but when I reload the page it appears constructed stylesheet, if I access it for the first time or reload with ctr + f5 it does not appear.

I have searched all the plugin code for some creation with CSSStyleSheet or createElement ("style"), but there is nothing.

How could I debug or search with the inspector what part of the code is generating this?

*constructed stylesheet*
.dc-ad {
    display: none !important;
}