Instead of using its own quadrants, Pedestal uses Slanted's.

This means that these quadrants never generate in Pedestal:

• trial_chambers/chamber/pedestal/quadrant_1 (render from the Minecraft Wiki)
• trial_chambers/chamber/pedestal/quadrant_2 (render from the Minecraft Wiki)
• trial_chambers/chamber/pedestal/quadrant_3 (render from the Minecraft Wiki)

Instead, these will:

• trial_chambers/chamber/slanted/quadrant_1 (render from the Minecraft Wiki)
• trial_chambers/chamber/slanted/quadrant_2 (render from the Minecraft Wiki)
• trial_chambers/chamber/slanted/quadrant_3 (render from the Minecraft Wiki)
• trial_chambers/chamber/slanted/quadrant_4 (render from the Minecraft Wiki)

This might also explain why some dispenser traps are covered behind walls.

How to reproduce?

1. Use /place structure minecraft:trial_chambers until you find a Pedestal room
2. Look at the quadrants

Example of seed where this happens

• -349722149179267981
• /execute in minecraft:overworld run tp @s -917.15 7.61 3006.36 -223.63 47.78