I was trying to build an upside-down stairs table retractable into the ground. However, when I placed the stair blocks next to each other so that they would "bend", Their bottom texture changed from regular to smooth, making it obvious where the table would pop up from. They didn't fit into the floor made of regular quartz blocks.

What I expected:

Bent regular quartz stairs to have a regular quartz block texture on the bottom

What happened:
They had a smooth quartz block texture instead

How to reproduce:

1. Place quartz stairs next to each other so they "bend"

1. Observe the bottom part as it changes textures