Elevator selection doesn't work with Optifine 1.15.2

[JayCeeCreates]

I have Optifine 1.15.2 pre30 and Sildur's Enhanced Default on, and every time I select an elevator area, this appears:

And when I finally selected an area, this happens:

All elevators created are vanished, but can still be interacted.

In other words, elevators would render properly, but the selection area apparently doesn't. A fix would be appreciated. :)