This same thing happens to me. If the phone battery completely drains and the phone turns off it will not charge. We tried the OEM charger and about 10 other type c and other usb chargers ranging from 0.5A and up. Nothing worked until I found a solution. SOLUTION: Use Samsung charger ETA-U90JWS with a generic cord. The samsung cord would not charge the phone. You have to use that charger and try different cords until a line starts flashing every few seconds on your screen. After that in about an hour you should see the power ring a lightning bolt. Then in about an hour you will see 1% and so on. Make sure to turn the phone on after 20% and swtich to an oem speed charger to finish charging as the ETA-U90JWS gets very hot charging the GS8. Just wanted to share my experience and solution. Samsung knows about this and is doing NOTHING to help people. My phone is recovering from SUPER DEAD MODE with that charger as I type this. This has happened to me like six times now. Thanks Samsung!
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