There will always be bugs in any complex piece of software.
If you are only seeking a stable tool for your everyday Arduino development work, then use the latest production release version of the Arduino IDE (currently 1.8.16).
The beta releases of the Arduino IDE 2.x are intended to offer the community the opportunity to participate in the early stages of creating what will surely become one of the cornerstones of the Arduino ecosystem for many years to come. High quality feedback, including bug reports and feature requests, from the users of the beta releases of Arduino IDE 2.x is very valuable and welcome. However, you can't really do that effectively if you are using an outdated beta release such as 2.0.0-beta.9. So, even though it may be that regressions have been introduced alongside the advancements made since then, I still think that if you are going to be using the beta release version, then you should be using the latest (currently 2.0.0-beta.12), or even better the latest nightly build.