Netherite can't be used as Beacon "fuel" nor base, even though all (other) materials from Iron upwards on the progressim system can.
Linked issues
duplicates 1
Comments 2
Thank you for your report!
We're actually already tracking this issue in MC-170899, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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This looks like a feature request rather than a bug