[doall]

I think it boils down to something like long term memory vs working memory.

In my experience, even if I get interrupted playing a piano score that I practiced hard, I still remember the whole notes and I can easily come back to the state, because the main thing to remember is where I have stopped playing and this easily fits in my working memory.

Opposed to that, when I'm in creative mode, I heavily rely on working memory and when I get distracted, new info comes in and my working memory easily blows up. I forget what I was thinking about and cannot come back to the state before I got distracted.