Error running config import "Call to a member function delete() on null in Drupal\Core\Config\ConfigImporter->checkOp()"

I can confirm that #8 works for me on 9.5.2.

Confirmed #8 is still working on 9.5.3 as well

Let’s treat this as a bug and someone please post a failing test.

If anybody's looking for a fix that doesn't involve patching core, I had success with this:

I had a lot of items that were failing import, so I created a directory to run a partial import from (partial-080323), and copied one of the config files there. It was a very normal config item, xmlsitemap.settings.yml, that probably wasn't breaking anything. I ran drush config:import --partial --source=../partial-080323/ and got a long string of "Missing required data for configuration:" notices, with this strange kicker:

The import failed due to the following reasons:
Deleted and replaced configuration "xmlsitemap.settings"

For whatever reason, after that, there weren't any config differences anymore and config import worked fine.