See Category:Top level, as example. With trying clicking to [+] button near any subcategories, returned error message "categorytree-collapse-bullet: Parse error at position 0 in input: "
Topic on Project:Village Pump/Flow
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See Category:Top level, as example. With trying clicking to [+] button near any subcategories, returned error message "categorytree-collapse-bullet: Parse error at position 0 in input: "