Ah. It looks like the sorting events are not returning jQuery objects. On line 72 and 82 of themes/ee/asset/javascript/src/fields/fluid_field/cp.js
can you change them to be FluidField.fireEvent($(ui.item).data('field-type'), 'beforeSort', $(ui.item))
and FluidField.fireEvent($(ui.item).data('field-type'), 'afterSort', $(ui.item))
respectively and let me know if that resolves it for you?
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