@roknrol @Zumbador @melindrea @LehtoriTuomo @actuallyautistic related - apparently the same is true for writing essays and it is common for Autistic folks to not be able to write an outline before writing the essay.
That's a problem I had in school - I would always have to write the whole essay first and then write the outline from it because how do I know what's going to be in the essay until I've written it?!