Probably not seeing KB4601319 because it's been further updated no fewer than 11 times. At least according to the MS updates site. The following updates superseded KB4601319
- 2021-02 Cumulative Update Preview for Windows Server, version 20H2 for x64-based Systems (KB4601382)
- 2021-03 Cumulative Update for Windows Server, version 20H2 for x64-based Systems (KB5000802)
- 2021-03 Cumulative Update for Windows Server, version 20H2 for x64-based Systems (KB5001567)
- 2021-03 Cumulative Update for Windows Server, version 20H2 for x64-based Systems (KB5001649)
- 2021-03 Cumulative Update Preview for Windows Server, version 20H2 for x64-based Systems (KB5000842)
- 2021-04 Cumulative Update for Windows Server, version 20H2 for x64-based Systems (KB5001330)
- 2021-04 Cumulative Update Preview for Windows Server, version 20H2 for x64-based Systems (KB5001391)
- 2021-05 Cumulative Update for Windows Server, version 20H2 for x64-based Systems (KB5003173)
- 2021-05 Cumulative Update Preview for Windows Server, version 20H2 for x64-based Systems (KB5003214)
- 2021-06 Cumulative Update for Windows Server, version 20H2 for x64-based Systems (KB5003637)
- 2021-06 Cumulative Update for Windows Server, version 20H2 for x64-based Systems (KB5004476)
So good luck figuring out how to roll that back. Thanks Microsoft.
