Visibility sugarlogic on checkbox stopped working in subpanels in v25.x

I upgraded to v25.1.2. and visibility formulas based on checkbox values stopped working in subpanels.

Unlimited is a checkbox and I need to show Quantity only if it's not Unlimited.

I had the visibility of the Quantity field set to:

equal($unlimited, 0)

Any thoughts why it's not working and how to fix it?

Thanks,

Francesca