https://www.babylonjs-playground.com/#KPXWT0#11
Just like the question says, I tried unfreezing the ground, but that did not seem to work.
I bet it wont work, I need all my matrices to be calculated in order to keep the reflection in the right place I guess?
after some research it looks like this parameter set to true causes the reflection to go off
scene._activeMeshesFrozen = true