SUMMARY
When putting a gradient on the stroke of a vector Krita will become unresponsive, though changing the fill to a gradient still works

STEPS TO REPRODUCE
1. Open Krita and create a file with a vector layer
2. Make a vector of any shape or size
3. Using the Tool Options docker change the stroke from "Solid" to "Gradient fill"

OBSERVED RESULT
Krita hangs indefinitely

EXPECTED RESULT
A simple default gradient gets applied 

SOFTWARE/OS VERSIONS
Windows: 10

ADDITIONAL INFORMATION
This use case was working in 4.2.6