I just tried for myself, and am seeing some wildly unexpected behavior.
I searched the forums for ‘Speed Boost’ and found this related issue.
Feel free to create a new issue in the bug reporting section if you don’t think that encapsulates the problem. (I’m also noticing this happens with the ‘Fire Trap’ in the Consumables folder)
I was able to work around this bug by placing a Floor, attaching speedboost to that, then rotating the floor and then rotating the speedboost.
Hope that helps.