List of steps to reproduce (step by step, including full links if applicable):

• I set up a new wiki
• I created a function "negate" taking a boolean and returning a boolean
• I want to create a composition, so I go to http://localhost:8080/wiki/Special:CreateZObject?zid=Z14&Z14K1=Z10000 (or I click on "Create a new implementation" on the function page which takes me there
• in the box "Select a function", I type "if" and I get the a dropdown with relevant functions

Screenshot of how the world looks like at this point:

• i select "If" from the Dropdown

What happens?:
The whole box where I would be entering my composition disappears. See screenshot.

What should have happened instead?:
It should select the If function and display me the three arguments for that instead.

Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.:
Fresh wiki as of January 27, 2022