Since the introduction of crouching in v0.1.6, there is a way to reach illegal high altitude by crouching in the air at the proper moment during jumping up.
Included in v0.2.2.
The reason was identified and the bug has been fixed. As of today there is no known corner case when reaching illegal altitudes is possible (rocket jumping is always a legal way).
Since the introduction of crouching in v0.1.6, there is a way to reach illegal high altitude by crouching in the air at the proper moment during jumping up.