Hmm, I'm not sure why it wouldn't be complete, but I'll try to fill in as much information as I can.
I use IntelliJ to code Java, my computer is a Macbook Pro, I don't run Minecraft on the same computer, after getting some advice from a modding Discord community I had tried a newer Forge version later and got the same issue, and then ultimately decided to wait until 1.16 was released to see if that helped.
I'm not sure how much of this is relevant, so sorry if some of it isn't.