Seeds not plantable when on landed rocket

I wanted to plant some plume squash on an asteroid to feed Experiment 52B, but the 'Plant' button was greyed out.  I determined that this was because the seeds were in my rocket (which was landed) rather than on the asteroid itself.  I was able to use "Copy Settings" from another asteroid to order one seed planted, but that is unintuitive and annoying.  Here is a video to see the bug in action.

There's also some mealwood seeds somewhere in the rocket, but I didn't want to look for them in the video.