Google is indexing WordPress RSS feed URLs for some posts, how do I fix it?

So i’ve been noticing for some time that Google is indexing URLs with feed reference for some of my posts. Google should actually index: https://www.mysitename.com/my-post-name

but it is indexing this URL: https://www.mysitename.com/my-post-name/?utm_source=rss&utm_medium=rss&utm_campaign=my-post-name

Is it fine or should I stop this? And how should I stop this? Thanks in advance.

I am using Yoast SEO plugin.