we haven't changed anything in preset 468 Electronica, nor in the LFO #1, from V3 to 3.51.
The preset has 4 banddelays frequencies swept by lfo 1. Using square wave is not recommended as the frequecies will jump from min to max and back, across their mod range. You may get some kind of clip if you don't reduce the Q setting. The preset is *meant* to be used with sine wave. Probably you did some other changes before.
If what you are looking for is a more "sample & hold" frequency mod, you could try algorithm 137 or 153 and 154. A nice example is Biomechanica 3, #244.
all the best