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23 July 2019 update:iOS 12.4 still appears to have this issue. We have filed a support case with Apple.

I too have started seeing this behavior, with the same delays and DNS lookups as reported above. First lookup to "captive.apple.com" then about 48s later a lookup to "www.apple.com" which finally triggers the captive-network-assistant pane to drop down a second or two later.I have as case open with my WiFi vendor, but it sounds like I'm going to need to open an Apple case also.Thanks for confirming my suspicions!