You can indeed run Minecraft on Linux. In my opinion, it’s even easier than running it on Windows, since you can use your package manager to install openjdk instead of fishing around Oracle’s website to get the Java 17 graphical installer. I use Prism, which is a 3rd party launcher, and I’m loving the experience.
It remains on light theme.
Edit: I am very silly and was forgetting to hit save. The fact that it was persisting in that tab when I navigated away, despite not having saved, gave me the mistaken impression that I didn’t need to save.