genesis block `cast block 0` formatting inconsistencies

[calbera]

• extraData shows greater than 32byte hex string (beacon-kit genesis EH shows the 0 32-byte hex string)
• (empty) withdrawalsRoot shows this but beacon-kit genesis EPH shows 0x792930bbd5baac43bcc798ee49aa8185ef76bb3b44ba62b91d86ae569e4bb535. Which empty root is correct?
• empty parentProposerPubkey shows as 0 instead of 0x000...000

% cast block 0
...
extraData            0x0000000000000000000000000000000000000000000000000000000000000000658bdf435d810c91414ec09147daa6db624063790000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
...
withdrawalsRoot      0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421
...
parentProposerPubkey 0