I’m not sure, but it might indicate a missing file, or something conflicting with the creation process.
First try to change the following configuraiton, and then re-try: https://i.imgur.com/I92mCiR.png
This configuration will try to reduce the load and potentially filter any shortcodes.
If that does not change anything, I might need temporary FTP and admin access to be able to check the issue directly. I will then try to debug the indexing process directly via FTP, to see if there is any unknown conflict there.Best,
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