Every cumulative update (including security-only updates) replaces termsrv.dll . You would need to reapply the patch after each update.
No. Server Core has no GUI, and modifying system DLLs is extremely risky. RDP Wrapper does not work on Core. windows server 2019 termsrvdll patch top
Replace it with the bypass code (e.g., B8 00 01 00 00 89 81 ). windows server 2019 termsrvdll patch top