Sorry, Loom URL didn't post correctly. It should be https://www.loom.com/share/188f18f3bc8e4da086438085e0a930f8?sid=4a85233a-aa8e-4e04-a529-d19af772783c

If jch optimize is causing problems with updates then the problem is with the extension not a Joomla issue
So before you update
Disable it
Clear cache
Remove it's code from the .htaccess

@Webdongle - that's only if it's an upgrade. It's also doing it for brand new 5.2 installs without JCH installed (no thing extra installed).

This happens if the corresponding Guided Tours component (com_guidedtours) has been disabled manually before the upgrade to Joomla! 5.2 by the user since the request in the modal window triggered by the plugin goes directly to the component, and the system returns a 404 status error:

Either the plugin should handle this request to hide the modal window or a check must be added to determine whether the component is enabled. If not, it must be enabled automatically during the update process.

I had to do another install yesterday. Just went into PHPMyAdmin and turned off the last entry under guided tours before logging into the Joomla Admin. A repair/work-around to the issue, but not a fix.

Unable to replicate this on a clean install

This usually happens when the component is disabled but not the plugin.

It happens on a brand-new, out-of-the-box install. It happens to me every time and the only way out of the loop is to go into PHPMyAdmin and unpublish the tour.

tried again and still cannot replicate this on a clean install

Check that the $live_site variable in the configuration.php is correct or empty. The guided tours in 5.2 has an autostarting-tour, kicking off on the admin dashboard. When the tour starts, the start URL (which is domain.tld/administrator/index.php) is compared with the current URL. The start URL however takes the live_site variable into account, so if that one is not correct, you might end up in a loop.

I never add anything to $live_site.