Verified that this is no more an issue. This was a server-side issue only, as discussed on this thread on slack : https://wikimedia.slack.com/archives/C7P3N5E6P/p1561662568069200 which iOS also observed, and is now resolved. I will still move it to QA just for confirmation.

cc @Charlotte

Could not reproduce on 2.7.50282-alpha-2019-07-08

reading lists do not sync properly. a subset of those on my Huawei M5 are not replicated to my Mate20 Pro

Thanks @Rallen444 - I've let our back end folks know on T226762.

thank you! love Wiki and have donated lots

all now fixed -- great job! 👍

Well, partly fixed.

if I add an article from your app on my phone it syncs to the app on my
tablet.

adding an article from your app on the tablet does not sync to my phone app