doesn't help, but I realized I was looking at it wrong.

That is the lower hose with the weird u-turn pipe. I thought that might be a sensor hole, but I am guessing now it must be for the drain.

I can't find anything that looks like this, and I can't imagine the engineer that thought it was a good idea.
Only thing I can think of is the fan would have cut into the hose if it had been on the other side like normal,