What UBI studies found this?

(The ones I've heard about, I'm fairly sure, didn't find anything of the kind. Which isn't to say that they show we should have UBI; there are big gaps between what has been tested so far and what an actual economy with UBI would look like.)

I've never heard of a UBI experiment that limited "toil". Nearly all UBI studies I've come across show an improvement in life satisfaction, reduced homelessness, drug use, etc.

I think you've taken the "work less" that was found in some studies to suggest they needed "toil". They simply found it somewhere else.