Plone-* resources not being loaded after 5.2.1 -> 5.2.2 upgrade

After upgrading a Plone site from 5.2.1 to 5.2.2, all plone-* related JS files are no longer being loaded (5.2.1 on the left, 5.2.2 on the right) functionality like folder_contents is no longer working:

The resource registry tells me something about a build error (I do not see any error messages on the console).

There is also a (pointless) hint to enable the debug mode for the resources registry inside the configuration registry....which key in the configuration registry is this exactly?

I think i have the same error. Should be this registry entry: plone.resources.development

But does not solve the problem :frowning:

Looks like it only happens if you active a custom diazo theme.

Going back to plonetheme.barceloneta = 2.1.6 solves the problem. Not yet sure which commit :frowning:

Going back to 2.1.6 works also for us. I will open an issue.

I have enabled/copy the script head tag in my theme. The backend.xml has a hint here

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