I use the XFCE Desktop. I noticed that my favorite icon set no longer properly covers the 3.1.3 audacity. All versions before that, it covered just fine. Last night I decided to try other icon sets. It seems like only about 3 out of 10 different icon sets even worked on it! I don’t understand what you guys changed, or why you changed it. But it broke most icon themes.
Here you can see what it is doing. I also have the Linux Mint XFCE themes, and none of them covered either.
I contacted the developer of the icon set. I may or may not be able to get a hold of the person.
https://www.pling.com/p/1356385
A person updated it. I also contacted them as well.
https://www.pling.com/p/1499265/
Note: The icon themes cover the XFCE desktop just fine, and I haven’t had any problems with any other program!
