RPC getblockstats call using genesis block

I am running a full node, bitcoin core 22. It is not in pruned mode.
But when I try to run RPC getblockstats call I get this.

$ bitcoin-cli getblockstats 0                                                                   
error code: -1
error message:
Can't read undo data from disk

I don’t have any error with block 1.
And I tested it in two different nodes in two different machines, and I get the same error.

Why this happens?

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