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the only error I see is the printcore takes too long to heat up, this can be caused by:
The heater of sensor being disconnected from the printcore.
a weird situation where a high temperature is requested and then a only slightly higher or lower, this can take long because the heating response will be slower as it's already almost at that temperature. E.G: have the initial temperature in the gcode header file be 300 degC and then having an M109 S305 in the gcode, this can cause the watchdog for that temperature change to time out. but this is after 10 minutes of waiting. you can fix that with Cura settings.
a bug where a communication error happens right as the temperature is set, this can caused by be environment.
The 1-2 does mean it's waiting for both hotends, so i could also be that the one hotend is working fine but the other one is not?
Yes, we saw this as well and have already fixed it, so it will definitely be fixed in a future software release. Since it doesn't actuality block use (it just super inconvenient) we decided it wasn't critical, so it did not block the 7.1.3 release at the time.
It will definitely be fixed by version 8.0.0 which is pretty much done, but I don't exactly know when that version will be released.
robinmdh's post in Conflict errors, print cores not reaching temperature was marked as the answer