There is a subscription and related Plesk domain named "domain.tld" registered in OBAS. When an additional domain named "new.tld" or "new.domain2.tld" is added to that subscription, it propagats to OBAS correctly. But when an additional domain (note: not a sub-domain) like "new.domain.tld" is added, OBAS ignores it. Therefore, related DNS records do not propagate to OBAS.
Currently it is not possible to propagate subdomain-like additional domains from Plesk to OBAS. Feature request PBAS-30273 was submitted and is considered to be implemented in future OBAS releases.
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It is possible to add necessary subdomain records into Plesk DNS parent domain zone manually.