Magma blocks can generate within trial chambers

The bug

Magma blocks can generate within trial chambers.

Here is an example:

Version: 23w45a

Seed: -3955354196018892310
Coordinates: /execute in minecraft:overworld run tp @s -346.09 -11.12 217.70 198.00 64.80

Expected behavior

Magma blocks would not be able to generate within trial chambers.