Pattern/sketch driven component pattern:

I edit the pattern to base it on a different feature.

It allows me to select the new feature.

It shows a preview of the new pattern.

It allows me to reset the seed position

Only then it says sorry you cant change the type of pattern on which the pattern is based and wont do it.

Surely it could give me a hint that it wont do what I want rather than leading me on like that?

SW2016