Using datatables.net-searchpanes as an ES6 module I had to edit node_modlues/datatables.net-searchpanes-dt/js/searchPanes.datatables.js and replace "searchPanes" with "searchpanes" (lower case "p")
Thanks, this was reported a few days ago (see here). It's been addressed in the nightly builds -you can find them here, and it will be included in the next release.
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