For some reason I didn’t know that the Chrome repo in yum.repos.d with a baseurl with stable in it also contained the unstable version, so I had installed it with the rpm file so rpm-ostree status showed it as local package. Uninstalling this and using the regular repo version instead seems to work, although they’re both Google-provided rpms, so I have no idea why this would make a difference except for updates later. Oh, well, it works now!
I want Wayland to be good in general, but the main reason I care about this is fractional scaling at 150%. On a 165-DPI laptop screen, everything is too small on zoom level 100, and text scaling is ugly and hacky. (200 is obviously out of the question.) Very happy about this! Now if the Electron-based flatpaks follow suit soon, that would really expand the range of usable applications for me with Wayland. I’ve swapped applications I like (VS Code for a combination of Neovim and Gnome Builder and Mark Text for Apostrophe) to avoid blurry text, but I like some of those apps, so I hope they’ll switch to Ozone soon.
EDIT: I know it’s early days still, but I’ve seen on Github that the Electron people are aware of the fact that it works in Chromium now. But does that mean that Electron Flatpaks will use Wayland automatically when the flathub base-app for Electron applications is updated? Probably way too early to tell yet.