Group and nodes are offset when pasting

I have an issue with ComfyUI since upgrading to version 0.17.2:
When I copy a group and paste it, the group frame and its nodes become misaligned. It seems the group frame is pasted at its original position, while the nodes are pasted at the center of the current canvas, causing an offset between them.
This problem still exists in the latest version 0.18.1.
My environment:
System: macOS 26
Device: M1 Max
ComfyUI running via command line (in browser)
Could this issue be caused by ComfyUI's frontend code?

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-10504-Group-and-nodes-are-offset-when-pasting-32e6d73d365081388626cafea9219376) by [Unito](https://www.unito.io)

Start by reproducing the copy-and-paste workflow in the ComfyUI frontend using a group with nodes, then inspect the frontend's group and node paste handling. Confirm the behavior on the reported versions and macOS environment. Done means the pasted group frame and its nodes remain aligned at the new canvas position.

Written by the indexing model from the issue text.