How to reproduce:
1. Create and open a new project
2. Create 2 of any 3D GameObjects and set their positions to (0,0,0)
3. Create Prefabs of the GameObjects
4. Enter the Prefab Edit Mode on the first prefab
5. Add the other Prefab to the Hierarchy 5 times
6. Observe the Scene view

Expected result: All instanced Prefabs are in the same position (0,0,0)
Actual result: All instanced Prefabs are in different positions

Reproducible in: 6000.1.0b3, 6000.1.4f1, 6000.2.0b2
Not reproducible in: 2022.3.62f1, 6000.0.49f1, 6000.1.0b2

Reproduced on: Windows 11 Pro (24H2)
Not reproduced on: No other environment tested

Notes:
- Before the regression, all instanced Prefabs are placed in their Transform positions relative to the parent
- The first prefab is instanced at the position at which the camera is looking