Hi Johnny,
I remember that, but in my case W.U. always offered the kb5004564 and was already downloaded when I created my first ISO.
but it created just 22000.1,
Probably it did not add the option in the converter to include all updates.
I now have both ISOs with or without kb5004564.
There is an option in the ConvertConfig.ini.
Guessing the CU windows10.0-kb5004564-x64.cab may have been in another folder in SoftwareDistribution when you created the ISO. Did you locate that file.
If you were using wimlib, with all the recent updates, possible it did not add the option. Forget which version, but one it did add updates, but the convert to esd option failed (skipped). Had to compress install.wim manually for flash card. Have not come across adding updates failing, unless I possibly got distracted and did not hit the proper keys.
Regards.