In version 2.1.1 if you enable vase mode with the check box, it sets infill to 0 as it should.
When you uncheck the box to disable vase mode it doesn't set the infill percentage back to the value it had previous to setting vase mode.
Here is the workflow:
1. For normal printing set an infill of 20%.
2. Check the vase mode box and then prepare a print.
2. Uncheck vase mode and then prepare another print. I would expect the infill to be set back to 20% but the infill will still be 0. You must manually set your infill back to 20%