Using start on any planet does rearrange certain researches depending on which planet you start on, so for personal transformers mk2 research, although I have all the researches connected to it, it won't let me queue it or research because I technically don't have the accumulator research, since you start out with the recipe.

Obviously the fix is just "don't play with the mod" but is there any way to force unlock it?

EDIT: I managed to fix it by forcing the accumulator research unlock with commands.

I don't know if you are the kind of guy that does compatibility patches like this, but I don't know how to remove this post so just take it down if you don't care about that stuff.

I'll see what I can do. I try to make it as compatible with most mods as possible. But obviously I don't have all the time in the world to test every niche case out there. I do like the idea of that mod, so lacking compatibility would be rather frustrating.

I have posted this issue to that mod's page (https://mods.factorio.com/mod/any-planet-start/discussion/67534a2a99b0b1d74d90d99f) and linked it back here. So, hopefully a resolution occurs soon.