Hi there @bobcat9374, welcome to the community!
Thank you for reporting this.
We have just updated our analyzers to support .NET9 (among other things) and we did take this change into account. We moved those rules out of SonarWay as there is effectively no way to know which runtime the app is going to run on, so the rules are not pertinent in the general case anymore.
You can read more about all the changes in the announcement.
Denis.