During the move from Classic autoloader to Zeitwerk import_export module was moved to correct file name convention. 427d54b2b0 (diff-d896ec33b95afb7fae9f8bfe73d0580b) Problem is that export/import is still using old path to require that module Meta: https://meta.discourse.org/t/topic-and-category-export-import/38930/40
427d54b2b0 (diff-d896ec33b95afb7fae9f8bfe73d0580b)