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Drupal 8/9 taking 40 seconds to load admin/modules after uninstalling custom module

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Drupal 8/9 taking 40 seconds to load admin/modules after uninstalling custom module

I’m attempting to learn custom block development by following the examples in the Drupal documentation. During development, I made a couple typos in the block which resulted in Drupal seeing the module as being deleted without having been uninstalled first. When I realized what I had done, I put the typo back in place then did a proper uninstall of the module. I then went back, fixed the typo and re-installed the module. From what I can tell, the bad module was uninstalled properly and the good module was installed properly, but now it takes roughly 40 seconds to load the admin/modules page. The site is pretty much a fresh site, so I could just wipe it and start over, but I would prefer to figure out the issue so if something similar ever happens to a production site I know how to troubleshoot and fix it.

Here’s what I’ve tried to do to fix this:
I’ve checked every log file I can find and see no errors reported anywhere.
I’ve checked the key_value table in the database and don’t see any reference to my module.
I installed the Module Missing Message Fixer module and it found nothing.
I’ve flushed the caches and run drush cr.
I’ve run update.php and rebuild.php with no results.
I even upgraded from D8 to D9 to see if that would fix it.

I’d like to fix this, but have no idea where else to look at this point. Does anyone have any thoughts on what the issue might be or suggestions as to where I should look next?

This article was republished from its original source.
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Drupal 8/9 taking 40 seconds to load admin/modules after uninstalling custom module

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