[Bugs] Android 10 update broke USB-C fast charging on Mi A3

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Hi folks,Could really use some assistance resolving a bizarre issue I'm having with my A3.My wife and I both bought identical Mi A3s ('Phone 1' and 'Phone 2') and, to take advantage of the fast-charge capacbilities, identical Cygnett PowerPlus 18W chargers (CY3085POPLU, 'Charger 1' and 'Charger 2'). Everything about this setup has worked perfectly on both devices until now. Yesterday, I accepted the OTA update to Android 10/June security on my phone ('Phone 1').  Ever since, Phone 1 has been unable to charge - upon plugging in the USB-C cable from either Charger 1 or Charger 2, the charging LED light flicks on, I get a notification ping and vibrate, Android flashes up a 'charging slowly' message, then half a second later the phone seems to 'disconnect' from the charging cable only to 'reconnect' again a half-second later, going through all the above again. This carries on endlessly, with Phone 1 sitting there pinging and buzzing away to itself until I remove the cable, never actually charging.Attempted troubleshooting findings:Phone 1 does not charge from either Charger 1 or Charger 2;Phone 1 does not charge from either Charger 1 or Charger 2 with a different USB-C cable;Phone 1 charged perfectly from both Charger 1 and Charger 2 until the Android 10 update, including charging from Charger 1 all the way through and during the OTA update to Android 10 (phone was plugged in at the time) - fault only started after reboot to apply update;Phone 2 (still on Android 9) works perfectly on both Charger 1 and Charger 2;Phone 2 (still on Android 9) works perfectly on both Charger 1 and Charger 2 with the same USB-C cable used to test Phone 1 with both Charger 1 and Charger 2;Factory reset of Phone 1 after Android 10 update has not resolved issue - continues to be unable to charge from Charger 1 or Charger 2;Other USB-C devices (old Mi A2, Nintendo Switch, Nintendo Switch Lite) all charge without issue from Charger 1 and Charger 2.Would appreciate any advice on how to resolve this - as far as I can see, the Android 10 update appears to have completely broken USB-C power delivery negotiation on the Mi A3, and I have no idea where to go from here to fix it. Obviously, my wife is very reluctant to apply any updates until this is resolved, which completely defeats the purpose of buying Android One devices.Any assistance would be gratefully received.

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