So far, so good with this latest build. I'm no longer having issues with dark/light mode wallpaper switching. I have gotten the "issue" where the Mail app is telling me there's an unread message(s), but when I look into it further, I see that the mail app isn't lying to me - there's unread mail in one or two of the mailboxes (I have four in my Mail app) that didn't show up in the All Inboxes view. Tapping in to the individual inbox of the offending account and deleting the message there "fixes" it. I've reported this bug.
Also, I've found that the Weight Watchers Mobile app ONLY works if it is on a fresh install of the app and you do not try to connect it to Apple Health. Defeats the purpose, I know. But, when you try to enable any of the reporting areas in Apple Health to connect with the Weight Watchers Mobile app, the app will immediately crash and will crash every time you try to open it again. Deleting the app and reinstalling it fixes the crash on load, but don't bother trying to connect it to Health just yet.