[Arrei]

We're aware of this, but it's not something we can fix. As you suspect, it's because NoCheatPlus erroneously thinks you're flying and firmly plants your butt back on the ground. The NoCheatPlus folks have themselves been notified of the issue long ago and have slowly been working towards fixing it, but haven't done so yet.

In the meantime, elevators work fine if you are riding in a minecart while going up, as with Slimejump, if that still exists.