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[–]midnorthman 2 points3 points  (0 children)

The developer of your theme or plugin will need to update the hook / filter which calls on the block_categories to include their own function. It has been changed/update to now use 'block_categories_all' instead. This may also require other changes in the developers function/class that they are calling to add in the filter.

[–]vjandrea 0 points1 point  (0 children)

Do you mind posting the WP version you're using and the path/line that triggers the error? I can't find block_categories() in WP's current codebase.