Windcard LE - the TXT record "_acme-challenge" is not being synchronized

Operating system: Ubuntu
OS version: 20.04.2
Virtualmin version: 6.16
Webmin version: 1.973
Update/Upgrade date: 2021-04-20
Slave DNS server: used, working and sync instantly when manually creating new records

While trying to generate a Wildcard Let’s Encrypt certificate with Virtualmin for a domain that syncs its DNS records to a slave DNS Virtualmin server, the DNS challenge fails, and I can see by using dig many times during the attempt that the record is not synced even once.

When manually creating any type of DNS record, it is instantly synced with the slave server.

Is anyone able to create wildcard Let’s Encrypt certificates using slave Virtualmin DNS servers?

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