They're working on it. You can track the status of it here:
https://github.com/koreader/koreader/issues/2235
Assume that when the ticket is closed, they'll have fixed KOReader to work properly on the Aura One. The main bottleneck right now is that the One is so new that none of the developers actually own the hardware to to do any of the development work. Give it a few weeks for them to catch up.