SharePoint Server Subscription Issue: Changing Look and Feel on start page very slow and errors

After deployment of SharePoint CU-Packages (23H2 CU) a strange error appears. When I tried to change the color schema (look and feel) it tooks very long and at the end the system shows me an error message: There was an error while trying to preview the theme


My patch status with this behavior:

Microsoft SharePoint Server Subscription Edition 1031 Language Pack
16.0.14326.20450 Installed
Security Update for Microsoft SharePoint Server Subscription Edition (KB5002474)
16.0.16731.20180 Installed

Microsoft SharePoint Server Subscription Edition Core 16.0.14326.20450 Installed
Security Update for Microsoft SharePoint Server Subscription Edition (KB5002474)
16.0.16731.20180 Installed

Luckily Carl Joakim Damsleth found the error in some JavaScript files and he wrote a script to fix it:

https://gist.github.com/damsleth/fba9b67318c1a966fdca67d32f0a7543

See my bug description and full story:

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