Just tried it out, I'm on May patch (SW ver SM-A505FN_OXM_SIO_PP_0007) and it's the same.
It seems that they have some bugs in the Night mode, see my post here: https://forum.xda-developers.com/showpost.php?p=79620370&postcount=12, where you can...
I'm on the latest May '19 update with my A50 (A505FN) and just discovered a very strange issue: when Night Mode is enabled, I can't change advanced settings on WiFi connection, or the Settings app will crash as soon as I tap on the "IP...
Thanks for the feedback. Can you please let us know what DNS servers do you use in settings? Did you configure the proxy directly somewhere on the phone or the network is routed to that machine?
In the meantime I got the info Blokada ...