If your Server 2019 is domain-joined, Group Policy may enforce RDS licensing modes, causing the patched DLL to conflict and log repeated Event ID 1024 (TerminalServices-RemoteConnectionManager) errors.
Microsoft frequently updates servicing stack components and core binaries via cumulative updates. When a Windows Update detects a modified or mismatched termsrv.dll file, it may: Termsrv.dll Patch Windows Server 2019 REPACK