In category description disappear adesnse after saving

I have always put an adsense on top of category.

Now if I put a new one or if I make a simple change, after saving disappear all lines beetween <script> and </script>
I tryed to install again last wordpress update and also to change editor.
No way.
For istance that’s the first line:

<script async src=”https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js”></script&gt;

In articles everything runs perfect.
Any idea how to fix?
Thanks