Is it so hard to read first two posts?
It is a breake for all phones, your redmi pro is not speciall. Just few most bugged (Oreo) phones recive bugfix versions until some day in June.
I wouldn't say it is stronger. Snap 820vs821 is not a big difference. Also they both have 3 and 4gb ram versions. The are very similar just Mi5 has this advantage that it is main model in this line. That's why it has faster updates.
I skipped 8.5.17 so I can't say. Overall it seem to works well.
Just flashed, all fine so far. It looks like the animations are a bit faster. But to more detailed review more time is needed.
Please check here:
https://xiaomi.eu/community/threads/global-rom-notification-style-port-for-xiaomi-eu-china-rom-developer-stable.43151/
However keep in mind that it may be not compatible with Oreo roms.
Could you consider to do hybrid ROM? Notification shade is the only thing on which global obliviously win with xiaomi.eu, and it would be great to see it here. It's definitely possible as there are even twrp-flashable zip's which add this feature.
That's why you should read release notes before flashing. There was already mentioned that depending on rom version from which you upgrade, you may have to do factory reset, because of compatibility issue. Anyway it is not a bug.
Ok, but how about Google Chrome? If you're watching a video and go to home screen it should bump to PiP, but it doesn't. Should we assume it is a xiaomi.eu bug?