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First Byte missing for iPhone 8 iOS 13 - Printable Version

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First Byte missing for iPhone 8 iOS 13 - SBtest - 06-04-2020 09:51 PM

Hi,
I tried to execute test using iPhone 8 iOS 13, I got the response as well, but I can see first byte data is missing there. Can somebody suggest why is this so.
Test URL: https://webpagetest.org/result/200603_AP_906e77945d84e399266307b57c9ec333/

One more query I have: When I use Moto g(gen 4/gen 6) with Firefox, I am not getting the performance data properly(first byte and #requests are missing). Even the waterfall is also not captured properly, While with chrome it working fine, any suggestions.
Test URL: https://webpagetest.org/result/200604_7W_e14edf22fec28096e4230776dab4f9b5/