Focus test negative value

From an earlier posted reply from Oz on Sept 28 on how the focus test works, Oz said it was possible to enter a negative Z value. I have not been able to enter a negative value. Is this working on V9.07?
Thanks

I misspoke - Ruida controllers won’t accept negative numbers at all. Does your controller use negative Z values? (LightBurn generally doesn’t emit them)

I have a GRBL controller from JTech, not sure about specifics, but it does accept negative z values.

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