Not sure when this happened, but it's not meant to. Haven't looked into it beyond noticing it happens yet.
Okay, so it seems this has always been the case in Loap, or at least for a long time now (I tested as far back as 0.0.16.0 and the bug was present). I also double-checked DOS L3D, and indeed the faller falls directly downwards there.
Fixed in commit 7ad1e46.