Nested Grid Elements Cannot Be Copied and Pasted Correctly in Version 10.1.0

[rtfirst]

I have checked that the bug exists in the dev-development branch
Yes, I get the same error.

I have checked that there are no already open issues or recently closed issues about this bug
Yes

Describe the bug
In version 10.1.0 of the FluidTYPO3 flux extension, it is not possible to correctly copy and paste nested grid elements in the TYPO3 backend. The copied nested grid elements are inserted incorrectly. This issue does not occur in version 10.0.10, where copied entries are correctly inserted during page editing. The content itself is gone.

To Reproduce
Steps to reproduce the behavior:

Go to the TYPO3 backend.
Create a grid element and nest another grid element inside it.
Copy the parent grid element and paste it elsewhere.
Observe that the nested grid elements are incorrectly inserted or not inserted at all.
Expected behavior
The copied parent grid element and its nested child grid elements should be correctly inserted in the page editing view, as is the case in version 10.0.10.

Screenshots
Screenshot 1: Shows the correct behavior in version 10.0.10.
Screenshot 2: Shows the incorrect behavior in version 10.1.0.

Additional context
This issue significantly affects page editing workflows where nested grid elements are used.

Screenshot 1

Screenshot 2

[rtfirst]

@NamelessCoder I'm not sure but maybe this has something to do with the Bugfix #2191