You can fall through the bottom of a Minigolf hole piece that’s set to Flag Hole or Flag Hole Dipped if the hole is large enough.
This happens with every Hole Size setting (can happen with Double and Triple if the piece is at 1x scale, but can also happen with Normal if the piece itself is upscaled).
This also seems to happen with any Tile Size and Platform Type (or at least all of the combinations of each that I’ve tried).
Notes / Media
The hole piece in the video is scaled 2x on all axes with ‘4x4’ Tile Size, ‘Flag Hole’ hole type, ‘Square U’ platform type, and ‘Normal’ hole size.