There was an issue with Android 5.0 Lollipop. The latest version (v1.23.1226) fixes this.
There’s a new experimental feature: Sitting on objects.
Currently it is a bit hard to use as you have to write the UUID of the object you want to sit on into the chat. The syntax is as following:
If you ommit the UUID your avatar will just sit on the ground. Standing up again works with:
/sit /stand /sit 01234567-89ab-cdef-0123-456789abcde
Just write it in the nearby chat. There will be no response.
Be aware that for now if the object animates your avatar, the animation will not stop when standing up. This can lead to strange behavior of the avatar.