We have published an upgraded version of the Card Sorting question theme. The question theme uses arrays instead of multiple short texts under the hood, which improves ease of localization, data standardisation and DB usage.
We will be using this theme in production, so any issues we encounter will get fixed in the public repo too.
Report from production run: This theme (and probably the original too) has an issue. In case you set the queston to mandatory and the responder clicks next without having dragged everything, the state resets to zero. Meaning all of their dragged positions are lost. In our case with a larger set of items, this added up to an effect of extra 40-50 seconds to the survey LOI. With large surveys, this can easily cost hundreds of dollars. A fix will be done soon.
Update 1.1
Resolved an issue where card positions would reset upon page reload (e.g., validation errors) by ensuring the script correctly reads values from hidden inputs.