Windows Server 2019 does not support NTFrs for the SYSVOL replication.
When you have created your AD Domain, it was probably running in a Domain Functional Level lower than 2008. In that case, the SYSVOL replication is using NTFrs.
Before migrate to Windows Server 2019 (Domain Controller), you must migrate the NTFrs service to DFSR.
This can be done easily by following these steps
https://techcommunity.microsoft.com/t5/storage-at-microsoft/streamlined-migration-of-frs-to-dfsr-sysvol/ba-p/425405
For the issue you currently have, do you still have your Windows 2008 DC ?
If yes, you could remove the 2019 DC, complete a metadata cleanup of the 2019 DC, migrate the NTFrs to DFSR migration and then add the 2019 DC in your domain.
hth
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