named service suddenly fails to start

[Reindl Harald]

Am 04.11.21 um 21:11 schrieb Grant Taylor via bind-users:
> On 11/4/21 1:27 PM, Bruce Johnson via bind-users wrote:
>> named-checkconf -z revealed a name had been entered with underscores. 
>> The person responsible has been sacked. (not really, merely reminded 
>> no underscores are allowed in A records :-)
> 
> You might want to apologize to them.
> 
> Underscores are legitimate in DNS record owner names, despite the 
> disagreement of their use in hostnames.

how does that matter in context of "no underscores are allowed in A 
records"?