Circular reference detected

That's interesting. I've never tried running Drupal without Drush. What I just found is, when I unsinstall simple_sitemap prior to removing Drush, other exceptions from core occur. Can you confirm it on your end?

RE: #2

I have disabled the "Submit changes to IndexNow capable engines" checkbox and removed drush and everything works fine now. I didn't notice any other exceptions from core.

So, it seems that the IndexNow part of the module has issue with drush only.

Looks like patch suggested in #3 did if for me too

Looks like the problem might be around the final logger (logger.drupaltodrush).

For me, trace was:
Got error 'PHP message: Uncaught PHP Exception Symfony\\Component\\DependencyInjection\\Exception\\ServiceCircularReferenceException: "Circular reference detected for service "Drupal\\Core\\Logger\\LoggerChannelFactoryInterface", path: "options_request_listener -> router.route_provider -> path_processor_manager -> simple_sitemap.engines.path_processor -> simple_sitemap.engines.index_now_submitter -> simple_sitemap.logger -> logger.channel.simple_sitemap -> Drupal\\Core\\Logger\\LoggerChannelFactoryInterface -> logger.syslog -> workspaces.manager -> logger.channel.workspaces"."

https://www.drupal.org/project/drupal/issues/3103620 🐛 Dependency on config storage causes circular reference in service container Needs review solved it for me

I just checked again, I get a similar error as you, but after clearing the site's caches the error is gone. After removing drush, you can clear the site's caches by visiting /core/rebuild.php or /update.php