### Steps to reproduce

1. create project A and activate type FEATURE there + add a member X
2. create project B and activate type TASK there
3. create work-package the following tree in A:
1. EPIC W1
1. TASK W2
2. TASK W3
3. EPIC W4 + assignee=X
1. TASK W5
2. TASK W6
4. copy W1 to B

### What is the buggy behavior?

* The following tree is generated:
1. EPIC W1
1. TASK W2
2. TASK W3
3. TASK Begin of the insertionW2‘End of the insertion Begin of the deletion W7End of the deletion in B
4. TASK Begin of the insertionW3‘End of the insertion Begin of the deletion W8End of the deletion in B
5. EPIC W4 + assignee=X
1. TASK W5
2. TASK W6
3. TASK Begin of the insertionW5‘End of the insertion Begin of the deletion W9End of the deletion in B
4. TASK Begin of the insertionW6‘End of the insertion Begin of the deletion W10End of the deletion in B

### What is the expected behavior?

1. the original tree stays intact
2. no additional work-packages are created at all
3. if and only if there are no errors => create an ADDITIONAL tree in B
4. everything else creates a complete mess and huge confusion to users because it's a mixture of copies and originals

### Screenshots and other files

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/71560/content">

**OpenProject version**

_12.5.8_