Is it actually causing sensor discovery errors, or just cosmetic errors in the debug output?
I’ve never used a Docker install, but you could try and edit the yaml discovery file temporarily in the container and see if it then allows correct rediscovery.
/opt/librenms/includes/definitions/discovery/poweralert.yaml
If that fixes things, someone could then help you submit that change to the codebase to be rolled in to future updates.
Based on the librenms docker documentation examples, maybe:
docker-compose exec librenms bash
… to get a prompt, then edit the end of the first line:
Would suggest spinning up another docker image to test this, or if you edit in place on your install, revert it when done so the daily script will continue to pull updates in the future.