Mesh instance doesn't provide it's rotation information after PhysicsImpostor was applied

The title of topic and this demo explains the problem: Babylon.js Playground (compare the output on lines 38 and 43). This happens only with rotation. position property works as expected.

If this was made intentionally please let me know how I can alternatively get current rotation of the instance. I need it to implement saving/loading functionality.

I do not think it is a bug as in this case, a rotationQuaternion is being used to the euler rotation can be disregarded: