chinook 0.5.5q (maybe I should go back to v0.5.5n, it was stable; q is listed as pre-release
On some Android versions, "Block connections without VPN" doesn't work with v055q, on some it does (like on our test devices running Android 13/14). This is one reason it has been hard to track down and fix it as the root-cause is elusive (and feels like, one or multiple bugs in various Android versions have been triggered by code in v055o onwards).
Though, from what I'm hearing from folks who reported issues over email or GitHub is v055r and v055t work just fine, where previously, v055q / v055p / v055o didn't.
froggy4711 Did you have any trouble with restoring the backup of a newer RethinkDNS version into the older version?
This is not supported, it won't work. There's multiple open GitHub issues to make this possible, but it isn't trivial. Let's see.