Trial chambers generate small empty rooms

Trial chambers can generate small (3x3x1) empty rooms behind walls. Also happens on 23w45a (havent tested other versions).

 

How to reproduce

1. Use seed -3955354196018892310 (experimental features turned on)
2.  

   /execute in minecraft:overworld run tp @s 67.45 -14.00 208.70 -541.11 6.77