Lab 6.4 Wrong expected DNS result?

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Hey there,

at the end of Lab 6.4 there is a table with dig commands on the left and expected/predicted answers on the right.
Everything fits except the answer to dig theworld.example.com @127.0.0.1 which should lead to 192.74.137.5.

I get a SERVFAIL with the SOA record of the internal example.com zone, which imo should be correct, because the local DNS server is the master and does not have an entry for theworld.example.com. Recursion is active, btw.

Thanks and regards