If you place two, two or higher stalagmites next to each other and fall in between the points then all fall damage will be negated
How to recreate:
Place two, two or higher stalagmites next to each other
Jump onto the frustum stage in between the points
Teleport yourself into the air and don't move while falling
Video was too large to upload so here is a one drive link: https://1drv.ms/v/s!AqXMheVatmV6miKbAqAGIqFyqQvs?e=vfvMj5
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is duplicated by 6
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1 more links
You do not need multiple stalagmites side by side, only one stalagmites is enough, but the bug doesn't seem to affect all sides.