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A little meta-update, while I am here:
After updating gu10.blog to WP 5.3 I spotted an error `o is not a function` when trying to update my content.
I also noticed that this error was hiding my categories and tags from the sidebar.
I noticed the error has already been reported here ,for now I will have to disable the plugin and continue with the core 6.7 version of Gutenberg.
UPDATE: It looks like the issue resurfaced and is again being discussed here: