Not sure if this is a bug or I'm just missing something, but there doesn't appear to be any way to select the recipe for liquid rocket parts? The liquid ports show on the ghost when building the platform but disappear when it's placed, and attempting to connect them doesn't work. It only accepts regular rocket fuel. Tried removing any other mods that modified the rocket platform with no results. Any idea what I'm missing here?

Did you already do the research?

Yes, I have unlocked the liquid rocket fuel and can make it, just no way to put it in the platform.

Ok, still i think it's highly likely that its probably some kind of mod compatibility issue. You should be able to select a recipe at the rocket silo. could you test with only this mod? and then slowly add your other mods back, to find out which one is causing it?
Could be any more messing with rocketparts also..

Yup, found it. It's this one: https://mods.factorio.com/mod/PlanetsLib

I hadn't fully read the description of that mod and didn't realize it made changes to rocket part recipes. My bad.

FYI in the recent release I've hopefully fixed the issue. Let me know if something is off.