pixi: Can't install gym[box2d]

Checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pixi, using pixi --version.

Reproducible example

See doc https://www.gymlibrary.dev/environments/box2d/

pip install gym[box2d]

pixi add --pypi gym[box2d]   

it puts

zsh: no matches found: gym[box2d]

Issue description

See above

Expected behavior

No error and install success