Able to slide on the curb at very specific angles at low walking speed

[Vateilka]

You can slide on the curb at very specific angles a low walking speed
Most likely due to the geometry being a small ramp.
Difficult to replicate with precision, but not impossible.
1st clip has items, I'm unsure about the minimum sliding speed, but the 2nd clip has no items.
View attachment CurbSliding.mp4