Child elements missing when copying a container element by drag & drop on the page tree

[rokhit]

Hi,

in my TYPO3 v13.4 instance, I try to copy a container element that contains child elements.

In the Page module I drag & drop the container element onto a page in the page tree. A modal window pops up, I activate the checkbox "Make copy instead of moving element", then I click on "Copy element to this position" at the location I want the element to be copied to.

The container element gets copied correctly, but all child elements are missing.

On the other hand, moving a container element instead of copying works correctly: the container element with its child elements are moved to the target position correctly.