The AnchorEntity only allows you to display entities. The entities attached to an AnchorEntity cannot collide with other entities in the scene (at least not in 1.0, this thing introduced in 2.0 seems promising). Therefore, it's display only.
We found out a workaround that if you enter immersive space with supportsGroupImmersiveSpace set to be false, and set it to true at a later point (in our case, we waited for 2 seconds). ARKit reports the correct transform after the 2 seconds wait.
Pixeland
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