Duplicate layer doesn't work

I enabled Cairo render in the Navigator and the Workarea.

I created a Duplicate layer above 1 Rotate and 1 Region. The parameters window showed the Duplicate valuenodes, with the “Index” valuenode jumping randomly between the values 1, 2, and 3. The application slowed down significantly. It seemed to be in a loop of some sort.

Deleting the Duplicate layer returned the application to normal.

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