Bug with Grouping and Task swapping

I am currently in the process of purchasing the commercial version and am checking its operation with a sample program.
https://docs.dhtmlx.com/gantt/samples/?sample='02_extensions/28_tasks_grouping_save_tree_structure.html'&filter=''
When grouping in resource or owner, if I swap some tasks and then move the task, for some reason the task position goes back to its original position.
Moving tasks after swapping tasks in priority is not a problem.
Is there any way to resolve this?

Hello Hayato,
Thank you for letting us know about that issue. I added it as a bug to our internal bug tracker. The dev team will fix it in the future, but I cannot give you any ETA.

Unfortunately, there is no workaround for that bug.

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