GLB animation cuts off after 4 seconds

Hi all!
Long time XR developer, first time Adobe Aero user (surface tracking beats all other webAR options rn - very nice!)
I have a tree with an animation exported from Blender. If i import this back into an empty blender file, everything is there and works as expected, animation is looping properly after 8 seconds/200 frames.

If i import it into Aero and play the animation on start, it always cuts off at 4 seconds.
I checked the few settings in the Aero animation panel, the clip length is set to 8, speed to 1, no transition and it's set to looping. Even if i extend the animation to 16 seconds (since i thought it might be a bug where it just cuts the animation in half) it stops and jumps back to start after 4 seconds.
If i import the same model as fbx, it works fine and plays the animation in full but the materials don't look as nice. Any tips??