(1) Interestingly, the new WUI works fine on my new iPad Air 3rd Generation, 2019, (13.1.2)
(2) Sometimes works on my 2011 iPad 3 (9.3.5) after rebooting the B2 a few times! Other times displays various coloured emojis in place of correct graphical images.
(3) Surprisingly it doesn't work at all on my Mobile, LG V40 ThinQ, 2018, (Android 9)