The "encounter" chamber in trial chamber generates very rarely

The new "encounter" chamber in trial chamber generates very rarely in the latest Bedrock preview. I tried to find it on every trial chamber and seemingly it isn't generated very often. There are 5 variants of "encounter" chambers. They should generate like how the changelog describe it:

Added new variations to the hallways, including "Encounters": Short challenges leading to a larger chamber.

Steps to Reproduce

1. Create a random world.
2. Find a trial chamber.
3. See any new chamber structure that was added.
4. Repeat from step 2.

Observed Result
There are almost no changes to the chambers.

Expected Result
The "encounter" chamber should generate common enough.