I don't know if your issue is still an issue and if this solves it, but it's worth a try and works fine for me:
Instead of adding the General Width and Height parameters, add the Width and Height parameters from an actual window object, these are called A and B.
(On the second image with the loaded parameters you should see the length icon instead of the arrow.)
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edit: I only see one screen shot image from the ones I tried to share. Oh, well... If you have questions about how to add parameters from objects, let me know.
macOS 15, ArchiCAD 26/27/28 (USA)
first ArchiCAD: 6.5