STEPS TO REPRODUCE 1. Have a vector layer. 2. In the Timeline panel, select a frame in that layer. 3. Press Delete. OBSERVED RESULT Nothing happens. EXPECTED RESULT A new blank frame should be yielded for that layer. SOFTWARE/OS VERSIONS Krita 4.2.9 (x64) Windows 10 Qt 5.12.7
This is not a bug. It's a simple fact that vector layer animation is not implemeted. There are many ideas for future animation development and I believe that this is just one of them that is being considered and may be implemented in the future.