Apple released the 11.5.2 update to macOS Big Sur today. They don’t really get into what is in it, they just say “bug fixes”. That is fine with me, Big Sur is a very buggy operating system. I have installed the 2.3 GB version on my 2019 Intel iMac without any problems, at least so far. I suppose I would recommend installing the update, but YMMV so proceed with caution as usual. You just get 11.5.2 in Software Update.
I discovered a list of known changes in the update, check out this article.