The issue happens because the Evaluate component needs its inputs to match the variable names in the expression (e.g., “x” and “y”). Enabling “Draw full names” can rename the inputs, causing errors.
To fix it, right-click the inputs and rename them to the correct variable names. The Expression component works similarly.
This problem was fixed in Rhino 8.14. More details here: RH-35790.
Thank You!